Using the Theory of Reasoned Action to Explain Physician Intention to Prescribe Emergency Contraception
CONTEXT: Although research has examined providers' knowledge, attitudes and prescribing behaviors with regard to emergency contraception, none has used a theory-based approach to understanding the interplay of these factors.
METHODS: A cross-sectional survey of 96 faculty physicians from one Southern and three Midwestern universities was conducted in 2004 to assess factors associated with intention to prescribe emergency contraception. The theory of reasoned action guided the study hypotheses and survey design. Correlation and regression analyses were used to examine the data.
RESULTS: Only 42% of respondents strongly intended to prescribe emergency contraception for teenagers, but 65–77% intended to do so for all other specified groups (women who ask for the method, who have had a method problem, who have experienced rape or incest, and who have had unprotected sex). Consistent with the theory of reasoned action, high intention to prescribe emergency contraception was associated with positive attitudes toward doing so and with the perception that specific colleagues or professional groups support prescribing it; however, the perception of support by colleagues or professional groups in general did not predict intention. Also consistent with the theory, physicians' knowledge about emergency contraception and their demographic characteristics were not significant.
CONCLUSIONS: Interventions to encourage physicians to provide emergency contraception should take into account their attitudes toward the method and the components of those attitudes.
Perspectives on Sexual and Reproductive Health, 2006, 38(1):20–27
Emergency contraception, or postcoital birth control, is used less often in the United States than in other countries.1 Many factors influence this difference, including differences in U.S. prescribing rates, women's and physicians' knowledge and attitudes, and accessibility. A complex dynamic exists among these factors, independent of prevailing attitudes about contraception in general and sexual responsibility in particular.2 This dynamic influences access to emergency contraception and is complicated by the need to use the medication within a particular window of time and by its cost.3 Emergency contraception is available without a prescription in more than 25 countries;4 in the United States, however, it remains prescription-based except in a few states (Alaska, California, Hawaii, Massachusetts, New Hampshire, New Mexico and Washington)5 that allow pharmacists to dispense it without a prescription under certain conditions. For the foreseeable future, most legally accessed emergency contraception will be available solely through prescription.
PRESCRIBING AMONG PHYSICIANS
The overwhelming majority of adolescent health experts and obstetrician-gynecologists have prescribed emergency contraception at some time; however, only half of general practitioners have done so, and of these, one-third have prescribed it fewer than six times.6 Emergency contraception prescribing differs by practice setting. In 2003, 74% of all faculty, residents and clinic nurses in a university-based family medicine department in the Midwest had prescribed emergency contraception, doing so, on average, 3.2 times in the previous 12 months.7 In the late 1990s, only 42% of women's health care providers at a large health maintenance organization in southern California had ever prescribed it.8 This proportion increased by almost 20% after a one-year demonstration project, which included the repackaging of oral contraceptives for use as emergency contraception, development of provider and patient education materials, and formal provider and staff training.9
In the 1990s, 20% of the members of the Washington, DC, chapter of the American Academy of Pediatrics had prescribed emergency contraception in the prior year, compared with 75% in a chapter in the New York City area.10 The disparity may be an artifact of differences in survey response rates (61% in Washington, DC; 24% in New York) or patient profiles. Some providers who prescribe emergency contraception restrict adolescents' ability to obtain the drug—for example, by limiting the number of times an individual can obtain it or limiting its availability on the basis of menstrual timing.11
It is unclear whether insufficient knowledge or attitude—conscious or unconscious—influences patterns of emergency contraception prescription. In a qualitative investigation focused on advance prescription of emergency contraception, one family practice physician remarked, "If you use contraception, it means for me that you are preventing things. But [if you use emergency birth control], you did not prevent." A "notable" minority of interviewees were wary of the method, principally because of the fear of irresponsible behavior as a result of its availability.12 Several well-designed studies, however, have shown that having a home supply from an advance prescription does not result in an increase in unprotected intercourse or a change in use of other contraceptives. Furthermore, women with a home supply of emergency contraception use the method in a more timely manner than women without such a supply.13
Emergency contraception's mechanism of action remains controversial and may influence physician prescribing. Theories about its mechanism include suppression or delay of ovulation and prevention of implantation.14 According to the National Institutes of Health definition of when life begins,*15 emergency contraception is not considered an abortifacient. Nevertheless, at the decade's beginning, 20% of women's health practitioners in a southern California health maintenance organization identified emergency contraception as an abortifacient,16 as had 39% of primary care residents at the end of the 1990s.17
We report on a survey of physicians practicing in academic settings, who provide care to women of reproductive age; these physicians may counsel patients about emergency contraception, prescribe the method and educate medical residents in the provision of this service. The survey, which was conducted in 2004 in three states where access to emergency contraception requires a physician's prescription, explored physicians' knowledge about, attitudes toward and practices regarding prescription of emergency contraception; it also asked about their beliefs about the method and perceptions of colleagues' attitudes toward prescribing it. We used the theory of reasoned action18 to examine the underpinnings of intention to prescribe emergency contraception, and to provide information about provider practices that might assist the design of interventions to increase physician-based access. No previous studies have applied theory to elicit an understanding of physicians' emergency contraception prescription practices.
The theory of reasoned action has been used to describe a variety of clinical practices among physicians and health care workers.19 The theory holds that intentions to engage in a behavior are most influenced by individuals' attitude toward engaging in the behavior and their perceptions of norms associated with it.20 Both attitude and perceived (or subjective) norms are measured directly and indirectly.
The direct measure of attitude is the overall evaluation of the behavior (e.g., prescribing emergency contraception is good or bad). The indirect measure is based on a person's beliefs that engaging in the behavior is associated with certain outcomes (behavioral beliefs), weighted by an evaluation of those outcomes. Thus, a behavioral belief about prescribing emergency contraception (e.g., the likelihood that prescribing emergency contraception would enhance women's reproductive options) is weighted by the person's evaluation of that behavioral outcome (e.g., enhancing women's reproductive options is good).
Subjective norms are determined by the individual's normative beliefs—the perception of how groups or individuals important to the person (i.e., social referents) view the behavior. The direct measure is the individual's overall assessment of whether his or her social referents approve or disapprove of the behavior. The indirect measure is the person's belief that each specific referent approves or disapproves of the behavior, weighted by the individual's motivation to comply with that referent's perspective.21 A physician's perception of partners' or colleagues' approval of prescribing emergency contraception is weighted by that physician's motivation to comply with them.
According to the theory of reasoned action, external variables, such as demographic characteristics and knowledge, do not predict intention. Because interventions to increase knowledge increase emergency contraception use among physicians,22 however, we added knowledge to our model.
Using the theory of reasoned action, we developed two hypotheses for exploration: Physicians' intention to prescribe emergency contraception will be most influenced by their attitudes toward the method and by their social norms; and knowledge about emergency contraception will not predict intention to prescribe.
Study Design and Sample
To guide the development of the survey questionnaire, we conducted elicitation interviews with community-based physicians ineligible for study participation, in which we asked about their beliefs about the consequences of prescribing emergency contraception, as well about as which professional colleagues were important to them. We pilot-tested the questionnaire among community physicians and nurse practitioners ineligible for study participation. The final questionnaire was based on their feedback.
Survey participants were faculty from primary care departments (obstetrics and gynecology, family medicine and pediatrics) at four universities in which we work, three in the Midwest and one in the South. They were recruited by physician "champions" from each department, who distributed the surveys on the basis of their knowledge about their colleagues' practices; for example, they excluded neonatologists or gerontologists. In two cases, distribution and completion of the surveys occurred during a departmental faculty meeting. In all others, participants returned the surveys to the researcher from their institution in preaddressed envelopes. No names or identifying data other than specialty, age and gender were collected. Each university's institutional review board approved the study with a waiver of written consent.
A total of 96 physicians responded to the survey, of whom 52% were family practitioners, 30% obstetrician-gynecologists and 18% pediatricians; the overall response rate was 70%. On average, respondents had been in practice for 15.8 years (range, 1–50). Ninety-seven percent were board- certified, and 62% were male. Their ages ranged from 29 to 79, and averaged 46.9 years.
•Intention to prescribe. The dependent variable was physician intention to prescribe emergency contraception. Participants were asked the extent to which they intend to prescribe emergency contraception to each of the following five groups: women who specifically ask for information about the method; women who have experienced incest or rape; women who have experienced a problem with their method, such as a condom break; sexually active teenagers; and women who request the method after having unprotected sexual intercourse. Responses were given on a seven-point scale (1="not at all," 7="very much"); thus, possible scores ranged between 5 and 35. An item that asked about opposition to prescribing emergency contraception was included in the survey but was not used to score intention. The item read "My opposition to emergency contraception precludes prescribing" and had the same seven-point response scale.
•Attitude. Our direct attitude measure was a sum of three scores that indicated how good or bad, how positive or negative, and how beneficial or harmful participants consider prescribing emergency contraception. Responses ranged from –3 (extremely bad, negative or harmful) to +3 (extremely good, positive or beneficial); the total score for this measure therefore ranged from –9 to +9.
For the indirect attitude measure, we weighted the beliefs about the outcomes by their evaluation. Using results of the elicitation interviews, we identified 10 beliefs that are common among physicians about possible outcomes of prescribing emergency contraception: It enhances a woman's reproductive options; discourages consistent use of other contraceptives; reduces the number of unintended pregnancies; reduces the number of abortions; takes too much clinical time; is inconvenient for the physician; encourages unprotected sex; poses health risks for women; causes frequent use of emergency contraception; and causes an abortion for a woman who has conceived. Participants were asked how likely each of these beliefs was to be true for them. Answers ranged from "extremely likely" (+3) to "extremely unlikely" (–3). Participants were also asked how good or bad each of these outcomes is; answers ranged from "extremely good" (+3) to "extremely bad" (–3).
•Subjective norms. The direct measure of subjective norms was based on a single statement using a seven-point Likert-type scale indicating whether participants thought that "in general…most people or groups important to [them]" thought that they should prescribe emergency contraception. Answers ranged from "definitely should" (+3) to "definitely should not" (–3).
The indirect subjective norms measure was formed by weighting individuals' beliefs about the specific professional referents by their motivation to comply with those referents. Two measures assessed physicians' beliefs about whether specific professional referents think they should prescribe emergency contraception (+3="definitely should" to –3="definitely should not") and how much they want to comply with each referent (1="not at all" to 7="very much"). The specific referents, identified from the elicitation interviews, were partners or colleagues; community physicians; professional organizations (i.e., the American College of Obstetricians and Gynecologists, the American Academy of Pediatrics and the American Academy of Family Physicians); and current medical standards of professional practice.
•Knowledge. Knowledge was measured by the number of correct answers participants gave to five multiple-choice and true-false questions about emergency contraception: its mechanism of action, its side effects, its association with birth defects, its effectiveness and when to prescribe it. These questions were based on the current literature.23
•Demographic. Six external variables, identified in the literature and pilot study, were included: specialty, adolescent subspecialty, board certification, years in practice, age and gender.
Univariate correlations between three domains (attitudes, subjective norms and knowledge) and intention to prescribe were performed using Spearman's correlation. Partial Spearman's correlations were used when the theoretical framework required measuring the association between a domain and intention to prescribe through a mediating domain.
We used generalized linear models to compare responses for each question and for each domain. If we detected significant differences, we used the least squares mean post hoc test to determine significant pairwise differences.
To explore the proposed hypotheses, we used generalized linear models with intention to prescribe as the outcome variable. The frequency distribution was generated, and summary statistics were produced using the mean, standard deviation and p values from generalized linear modeling. Coefficients were estimated, and models were reduced in a backward fashion when appropriate. All analyses were performed using SAS, version 8.
For the correlation and regression analyses, intention to prescribe emergency contraception was a continuous variable with scores ranging from 5 to 35. To compare the mean scores of physicians' beliefs about prescribing emergency contraception and their perception of what their social referents wanted them to do, we classified intention to prescribe as low (score of less than 26), medium (26–34) or high (35).
At the univariate level, attitude, subjective norms, behavioral beliefs about the outcomes of prescribing emergency contraception and normative beliefs about specific professional referents significantly correlated with intention to prescribe (Table 1). Three variables were not significantly correlated with intention to prescribe emergency contraception: evaluations of the outcomes; motivation to comply with professional referents; and knowledge about emergency contraception. None of the external (demographic) variables were significantly correlated with intention (not shown).
In the regression analyses, attitude and the indirect measure of subjective norms predicted physician intention to prescribe. The more positive physicians' attitudes about emergency contraception were, the greater their intention to prescribe the method (estimated beta=1.39, p<.001); and the greater the perception that specific professional referents approved of prescribing emergency contraception, the higher the intention score (estimated beta=0.05, p<.05). The direct measure of subjective norms, however, did not predict intention to prescribe.
Emergency contraception knowledge scores ranged from 0 to 5, and they averaged 3.76 (standard deviation, 1.30). Twenty-eight percent of physicians correctly answered all five questions, 46% percent gave four correct answers and 14% gave three. Only 11% scored less than three, including 6% who scored zero. Almost all respondents (98%) knew that emergency contraception has only minimal side effects (Table 2); most knew that birth defects are not a side effect (93%) and that emergency contraception is effective at least 75% of the time (90%). Eighty-two percent of respondents knew that emergency contraception is thought to work by preventing implantation of a fertilized egg or delaying ovulation, but some thought that it prevents fertilization or causes expulsion of a fertilized egg.
The majority of physicians (65–77%) responded "very much" regarding the extent to which they intended to prescribe emergency contraception to four of the five groups of women specified in the survey; the largest proportion was for prescribing the method to women who have experienced rape or incest (Table 3, page 24). Only 42%, however, reported "very much" with respect to prescribing it to sexually active teenagers. Eight percent of physicians "very much" agreed that their opposition to emergency contraception precluded prescribing it, and 4% reported a neutral score on this item (not shown).
Among the 92 physicians who indicated their intention to prescribe, 39% were classified as having a high intention, 42% as medium and 19% as low. Statistically significant differences between groups were found for every belief about the consequences of prescribing emergency contraception (Table 4, page 24). High intenders were more likely than low intenders to believe that prescribing the method reduces the number of unintended pregnancies, enhances a woman's reproductive options and reduces the number of abortions. They were less likely than low intenders to believe that prescribing it discourages consistent contraceptive use, encourages unprotected intercourse, leads to frequent use of postcoital birth control, poses health risks, causes an abortion if a woman has conceived, takes too much clinical time and is inconvenient.
Compared with high intenders, medium intenders were less likely to believe that prescribing emergency contraception enhances a woman's reproductive options, and were more likely to believe that it encourages unprotected sex, causes frequent use of emergency contraception, takes too much time and is inconvenient. They were more likely than low intenders to believe that prescribing emergency contraception reduces the number of unintended pregnancies and abortions, and were less likely to believe to believe that it causes an abortion or is inconvenient.
By contrast, statistically significant differences in the evaluations of these beliefs occurred for only four items. High intenders had the most positive view of enhancing a woman's reproductive options. They also had more positive views than low intenders of reducing the number of unintended pregnancies; they gave less negative evaluations than low intenders to causing frequent use of emergency contraception and causing an abortion if a conception occurred. Compared with low intenders, medium intenders evaluated enhancing a woman's reproductive options more positively; they gave less negative evaluations to causing overuse of emergency contraception and causing an abortion if the woman had conceived.
Perceived support from professional organizations did not differ significantly by intention to prescribe (Table 5). Compared with low intenders, high intenders considered current medical standards, their partners or colleagues, and community physicians more supportive of their prescribing emergency contraception; medium intenders viewed current medical standards as more supportive than did low intenders. With regard to physicians' motivation to comply with these professional referents, only two differences between groups were statistically significant: Both high and medium intenders were more inclined than low intenders to want to comply with current medical standards.
Attitudes and Subjective Norms
As predicted by the theory of reasoned action, physician attitudes toward prescribing emergency contraception strongly predicted intention to do so. Contrary to the theory, the direct measure of subjective norms—reflecting physicians' general perception of colleagues' support for prescribing—did not predict intention to prescribe. Our interpretation is that physicians may have such strong opinions about the positive or negative aspects of prescribing emergency contraception that they disregard their professional referent groups' perspectives.
This explanation does not fully explain, however, the seemingly contradictory finding that the indirect measure of subjective norms—physicians' perceptions of specific referents' support of prescribing emergency contraception, weighted by their motivation to comply—predicted intention. Perhaps physicians felt differently when responding to a general perception than they did when responding to expectations tied to specific individuals and groups, which resulted in inconsistent answers in the direct and indirect measures of subjective norms. Nevertheless, this finding is inconsistent with the theoretical model and deserves further study.
It is not surprising that physicians with higher scores for intention to prescribe emergency contraception held more positive beliefs and evaluations about the outcomes of prescribing than did those with lower scores. High intenders had stronger perceptions that all but one of the specific professional referents thought they should prescribe emergency contraception. Their motivation to comply with specific professional referents, however, did not differ from that of medium and low intenders except for compliance with current medical standards. This is likely why motivation to comply did not significantly correlate with intention to prescribe emergency contraception.
Both the American College of Obstetricians and Gynecologists and the Society for Adolescent Medicine have published practice bulletins regarding emergency contraception. The former calls for physicians and, as appropriate, their staff to be familiar with the method, to ensure that women can obtain it promptly (including by providing advance prescriptions or supplies) and to prescribe it over the phone without requiring an office visit.24 The latter encourages adolescent health care providers to offer all females an advance prescription or an advance course of emergency contraception to have in the event of unprotected intercourse or contraceptive failure.25 The American Academy of Pediatrics supports prescribing emergency contraception by phone (in conjunction with a patient history and follow-up visit), and instructs pediatricians to stress the method's emergency nature and inappropriateness as an ongoing contraceptive.26 The American Academy of Family Physicians mentions emergency contraception only within the context of treatment of rape victims;27 the method is not discussed in the organization's statement on adolescent health care, sexuality and contraception, or in its statement on reproductive decisions.
The American College of Obstetricians and Gynecologists' and the Society for Adolescent Medicine's endorsements of the method may be a factor in the high rates of prescribing among obstetricians and gynecologists nationally. Our study did not examine specialties separately, but it did find that both high and medium intenders were more inclined to want to comply with medicolegal standards, which are based in part on professional organization policy. The American Academy of Family Physicians, in its support for "the concept that no physician or other health professional shall be required to perform any act which violates personally-held moral principles,"28 supports family practice physicians who decline to prescribe emergency contraception because of moral objections.
Knowledge and Demographic Characteristics
Knowledge of emergency contraception is, of course, a requisite for prescribing, and interventions that increase knowledge alone have been successful in increasing emergency contraception prescribing.29 Our findings suggest that knowledge about the method is not associated with the intention or willingness to prescribe it; however, one could challenge our limited selection of knowledge questions. Current scientific thought states that pregnancy begins at implantation, not at fertilization;30 this belief, however, is disputed by many, including some physicians.31 Although the literature is clear that emergency contraception cannot disrupt an established pregnancy, those who believe that pregnancy begins at fertilization consider the method an abortifacient; if they morally object to abortion, they object to emergency contraception on the same grounds.
Although some previous research has found that physician gender is associated with the provision of preventive counseling and screening in general,32 we found no gender difference in the intention to prescribe emergency contra- ception. The lack of correlation between demographic variables and intention to prescribe is consistent with the theoretical model. No studies have shown that women physicians maintain more positive attitudes about emergency contraception than do male physicians.33
Our results must be interpreted in the light of a number of study limitations. The results cannot be generalized because the survey was conducted among convenience samples at four hospitals in the Midwest and South. Furthermore, the survey did not obtain information about patient populations, such as the proportion of adolescents among pediatricians' and family practitioners' patients or the proportion of family practitioners' patients who are women of reproductive age. In addition, because the survey was anonymous, we were unable to track nonrespondents.
Another important limitation is that we measured only intention to prescribe, not actual prescribing behavior. A prospective study design would be able to test the assumption that physicians' intention reliably predicts prescribing behavior; future research using a prospective study design is recommended.
The theory of reasoned action does not measure individuals' perceptions of their ability to control their behavior. To include such a measure, we could have used the theory of planned behavior, which Azjen developed in the mid-1980s by expanding the theory of reasoned action.34 In addition to a variable for perceived behavioral control, the new theory included the extent to which individuals perceive control over their ability to engage in a behavior. However, we used the theory of reasoned action because intention to prescribe emergency contraception is within physicians' immediate control; their perceptions of whether they can prescribe emergency contraception would not add to our understanding of intention.
The knowledge quiz in the survey may not have represented a complete assessment of physicians' knowledge about emergency contraception. The major side effects associated with emergency contraception occurred with Preven, which is no longer used but which may have resulted in confusion on the part of physicians who prescribe the method infrequently.35
Our elicitation interviews and pilot tests involved community physicians rather than academic faculty, who constituted our study sample, and the two groups might have different perceptions of consequences and social referents. However, we supplemented these results with findings from the literature.36
Finally, we did not rely on a validated measure in categorizing intention as high, medium or low. We assumed that physicians who scored an average of five on each item assessing intention leaned toward intending to prescribe. We categorized intention in this manner because of a belief that the greatest changes in prescribing may occur with interventions targeted to medium intenders. Low intenders are probably less amenable to intervention because of a moral bias against emergency contraception that views it as an abortifacient.37
Implications for Practice
This study suggests an alternative approach to interventions aimed at increasing emergency contraception availability to women. Understanding provider attitudes and their underlying components could be a more productive direction to pursue in encouraging physicians to prescribe emergency contraception. This might be accomplished in an educational program by pretesting the group and delivering different interventions tailored to providers' intention to prescribe. Practitioners with a high score for intention might merely need reinforcement about their prescribing practices or information about advance prescriptions for all sexually active women. Interventions for practitioners with a medium score for intention to prescribe could include discussions and case scenarios about whether emergency contraception encourages contraceptive irresponsibility and leads to inappropriate reliance on the method. Results of studies addressing concerns about reliance on emergency contraception might be discussed in detail, instead of being summarized. For physicians who are low intenders or who consider it morally important to withhold emergency contraception, we would suggest making these attitudes well- known to patients and other health care providers. Such awareness could prevent women whose physician is unwilling to provide the method from experiencing embarrassment, self-doubt or the aggravation that accompanies inconvenience, not to mention the complications of delayed access to the method. A goal in working with physicians in this group might be to differentiate between personal ethics and professional ethics, and encourage them to redirect women to practitioners who would meet their reproductive health needs.
Targeted discussion for all physicians might include examining belief systems about birth control and sexuality. Particular beliefs, such as those that equate contraception with planning to have sex, may be supported by an unconscious moralizing. Exploring these beliefs, their values and the limitations they impose could result in shifting to a paradigm that recognizes the benefits of the full range of reproductive options.
Another barrier to prescribing of emergency contraception by high and medium intenders is structural, such as how much clinic time is necessary to discuss and provide the method. This issue might be addressed by delegating responsibilities to nurses, social workers, health educators or peer educators. Clinic protocols can be developed for nurses to include discussion about emergency contraception when educating sexually active women of reproductive age about birth control options. For women specifically requesting emergency contraception, protocols could be developed, and would be appropriate, for nurses to call in prescriptions or dispense the method within clinic settings.
A troubling finding is that only 42% of respondents would readily prescribe emergency contraception to sexually active teenagers. Adolescent pregnancy truncates childhood. Although U.S. adolescent pregnancy rates are at an all-time low,38 it is unrealistic for providers to think that not prescribing emergency or other contraception can change this.39 Implicit in these attitudes is the assumption that withholding contraception can influence women's behavior. It may be beneficial to discuss with providers the social context of adolescent sexual activity, including the dissociation between sexual activity and contraception among many adolescents.40
Provision of emergency contraception to rape and incest victims seems to be the least controversial indication for its use, and protocols have been recommended for offering the method to women who go to an emergency room following an incident of rape or incest.41 Indeed, the majority of the physicians in our study indicated the highest degree of intention to prescribe emergency contraception for this purpose. Nevertheless, one-quarter had reservations about prescribing emergency contraception to victims of rape and incest. More information is needed about these reservations; qualitative studies might be useful in this regard.
1. The Alan Guttmacher Institute (AGI), Emergency contraception: improving access, Issues in Brief, No. 3, 2003, <http://www.agi-usa.org/pubs/ib_3-03.pdf>, accessed Dec. 23, 2005.
2. Hatcher RA et al., Contraceptive Technology, 18th ed., New York: Ardent Media, 2004.
3. Jackson R et al., Knowledge and willingness to use emergency contraception among low-income post-partum women, Contraception, 2000, 61(6):351–357.
4. International Consortium for Emergency Contraception, Over-the-counter availability of emergency contraception, news release, July 1, 2004, <http://www.cecinfo.org/files/ICEC%20Press%20 Release-The%20Case%20for%20EC%20OTC-July%202004.pdf>, accessed Dec. 22, 2005.
5. AGI, Emergency contraception, State Policies in Brief, 2005, <http://www.guttmacher.org/statecenter/spibs/spib_EC.pdf>, accessed Dec. 22, 2005.
6. Kaiser Family Foundation, National Survey of Women's Health Care Providers on Reproductive Health: Emergency Contraception, Menlo Park, CA: Kaiser Family Foundation, 2003; and Gold MA, Schein A and Coupey SM, Emergency contraception: a national survey of adolescent health experts, Family Planning Perspectives, 1997, 29(1):15–24.
7. Wallace JL et al., Emergency contraception: knowledge and attitudes of family medicine providers, Family Medicine, 2004, 36(6): 417–422.
8. Sherman CA et al., Emergency contraception: knowledge and attitudes of health care providers in a health maintenance organization, Women's Health Issues, 2001, 11(5):448–457.
9. Beckman LJ et al., Changes in providers' views and practices about emergency contraception with education, Obstetrics & Gynecology, 2001, 97(6):942–946.
10. Golden NH et al., Emergency contraception: pediatricians' knowledge, attitudes, and opinions, Pediatrics, 2001, 107(2):287– 292; and Sills MR, Chamberlain JM and Teach SJ, The associations among pediatricians' knowledge, attitudes and practices regarding emergency contraception, Pediatrics, 2000, 105(4):954– 956.
11. Golden NH et al., 2001, op. cit. (see reference 10); Kettyle EP and Klima C, Adolescent emergency contraception: attitudes and practices of certified nurse-midwives, Journal of Midwifery and Women's Health, 2002, 47(2):68–73; Gold MA, Schein A and Coupey SM, 1997, op. cit. (see reference 6); and Sherman CA et al., 2001, op. cit. (see reference 8).
12. Karasz A, Kirchen NT and Gold M, The visit before the morning after: barriers to preprescribing emergency contraception, Annals of Family Medicine, 2004, 2(4):345–350.
13. Ellertson C et al., Emergency contraception: randomized comparison of advance provision and information only, Obstetrics & Gynecology, 2001, 98(4):570–575; Glasier A and Baird D, The effects of self-administering emergency contraception, New England Journal of Medicine, 1998, 339(1):1–4; Gold MA et al., The effects of advance provision of emergency contraception on adolescent women's sexual and contraceptive behaviors, Journal of Pediatric and Adolescent Gynecology, 2004, 17(2):87–96; Jackson RA et al., Advance supply of emergency contraception. Effect on use and usual contraception—a randomized trial, Obstetrics & Gynecology, 2003, 102(1):8–16; and Raine TR et al., Direct access to emergency contraception through pharmacies and effect on unintended pregnancy and STIs: a randomized controlled trial, Journal of the American Medical Association, 2005, 293(1):54–62.
14. Ling WY et al., Mode of action of dl-norgestrel and ethinyl estradiol combination in postcoital contraception: II. Effect of post-ovulatory administration on ovarian function and endometrium, Fertility and Sterility, 1983, 39(3):292–297; Marions L et al., Emergency contraception with mifepristone and levonorgestrel: mechanism of action, Obstetrics & Gynecology, 2002, 100(1):65–71; and Swahn ML et al., Effect of post-coital contraceptive methods on the endometrium and the menstrual cycle, Acta Obstetricia et Gynecologica Scandinavica, 1996, 75(8):738–744.
15. National Institutes of Health, First trimester pregnancy, 2003, <http://www.nlm.nih.gov/medlineplus/ency/article/000887.htm>, accessed Mar. 15, 2005.
16. Sherman CA et al., 2001, op. cit. (see reference 8).
17. Veloudis GM and Murray SC, Emergency contraception knowledge and prescribing practices: a comparison of primary care residents at a teaching hospital, Journal of Pediatric and Adolescent Gynecology, 2000, 13(3):125–128.
18. Azjen I, Attitudes, Personality, and Behavior, Bristol, UK: Open University Press, 1988; and Azjen I and Fishbein M, Understanding Attitudes and Predicting Social Behavior, Englewood Cliffs, NJ: Prentice Hall, 1980.
19. Godin G, Naccache H and Fortin C, Understanding physicians' intention to use a simple infection control measure: wearing gloves, American Journal of Infection Control, 1998, 26(4):413–417; Levin PF, Test of the Fishbein and Azjen models as predictors of health care workers' glove use, Research in Nursing and Health, 1999, 22(4): 295–307; and Millstein SG, Utility of the theories of reasoned action and planned behavior for predicting physician behavior: a prospective analysis, Health Psychology, 1996, 15(5):398–402.
20. Azjen I, 1988, op. cit. (see reference 18); and Azjen I and Fishbein M, 1980, op. cit. (see reference 18).
21. Azjen I, 1988, op. cit. (see reference 18); Azjen I and Fishbein M, 1980, op. cit. (see reference 18); and Montano DE, Kasprzyk D and Taplin SH, The theory of reasoned action and the theory of planned behavior, in: Glanz K et al., eds., Health Behavior and Health Education: Theory, Research, and Practice, third ed., San Francisco: Jossey-Bass, 2002, pp. 67–98.
22. Beckman LJ et al., 2001, op. cit. (see reference 9).
23. Ling WY et al., 1983, op. cit. (see reference 14); Marions L et al., 2002, op. cit. (see reference 14); and Swahn ML et al., 1996, op. cit. (see reference 14).
24. American College of Obstetricians and Gynecologists, ACOG practice bulletin: emergency contraception, Obstetrics & Gynecology, 2005, 106(6):1443–1452.
25. Society for Adolescent Medicine, Provision of emergency contraception to adolescents: position paper of the Society for Adolescent Medicine, Journal of Adolescent Health, 2004, 35(1):66–70.
26. American Academy of Pediatrics Committee on Adolescence, Emergency contraception, Pediatrics, 2005, 116(4):1026–1035.
27. American Academy of Family Physicians, Policy and advocacy statement on rape victim treatment, 2002, <http://www.aafp.org/ x16631.xml>, accessed Aug. 12, 2005.
28. American Academy of Family Physicians Policy and advocacy statement on reproductive decisions, 2005, <http://www.aafp.org/ x7053.xml>, accessed Aug. 12, 2005.
29. Beckman LJ et al., 2001, op. cit. (see reference 9); and Heimburger A et al., Emergency contraception in Mexico City: knowledge, attitudes, and practices among providers and potential clients after a three-year introduction effort, Contraception, 2002, 66(5):321–329.
30. National Institutes of Health, 2003, op. cit. (see reference 15).
31. Larimore WL, Stanford JB and Kahlenborn C, Does pregnancy begin at fertilization? letter, Family Medicine, 2004, 36(10):690–691.
32. Henderson JT and Weisman CS, Physician gender effects on preventive screening and counseling: an analysis of male and female patients' health care experiences, Medical Care, 2001, 39(12): 1281– 1292.
33. Abdel-Aziz E, Arch B and Al-Tahner H, The influence of religious beliefs on general practitioners' attitudes towards termination of pregnancy—a pilot study, Journal of Obstetrics and Gynaecology, 2004, 24(5):557–561.
34. Azjen I, From intentions to actions: a theory of planned behavior, in: Kuhl J and Beckman J, eds., Action-Control: From Cognition to Behavior, Heidelberg: Springer, 1985, pp. 11–39.
35. Hatcher RA et al., 2004, op. cit. (see reference 2).
36. Wallace JL et al., 2004, op. cit. (see reference 7); and Karasz A, Kirchen NT and Gold M, 2004, op. cit. (see reference 12).
37. Larimore WL, Stanford JB and Kahlenborn C, 2004, op. cit. (see reference 31).
38. Santelli J et al., Can changes in sexual behaviors among high school students explain the decline in teen pregnancy rates in the 1990s? Journal of Adolescent Health, 2004, 35(2):80–90.
39. Hacker K et al., Listening to youth: teen perspectives on pregnancy prevention, Journal of Adolescent Health, 2000, 26(4):279–288; and Reddy D, Fleming R and Swain C, Effect of mandatory parental notification on adolescent girls' use of sexual health care services, Journal of the American Medical Association, 2002, 288(6):710–714.
40. Brückner H, Martin A and Bearman PS, Ambivalence and pregnancy: adolescents' attitudes, contraceptive use and pregnancy, Perspectives on Sexual and Reproductive Health, 2004, 36(6):248–257.
41. Smugar SS, Spina BJ and Merz JF, Informed consent for emergency contraception: variability in hospital care of rape victims, American Journal of Public Health, 2000, 90(9):1372–1376.
The authors acknowledge support received through the Big 12 Faculty Fellowship and thank Melody Jorgenson for her assistance with data entry.
*"The first trimester of pregnancy begins when a fertilized egg implants into a woman's uterus. This occurs about 7 days after the egg is fertilized."
After examining the distribution of intention scores across participants, we initially classified participants into one of three intention groups: high (top 25%), medium (middle 50%) and low (lower 25%). These groups had intention scores of 35, 28–34 and less than 28, respectively. However, we shifted four participants with scores of 26–27 from the low to the medium group, as we thought that they would more closely resemble medium than low intenders.