Volume 32, Number 5, November/December 2000

TABLES

Table 1. Percentage distribution (and standard errors) of U.S. women aged 15-44 with a recent singleton birth, by selected characteristics, according to relationship type at conception, 1995 National Survey of Family Growth
Characteristic All Relationship type
Married Cohabiting Other
(N=2,578) (N=1,675) (N=341) (N=562)
Relationship duration at conception (in mos.)†
<=12 17.6 4.3 (0.6) 32.2 (3.3) 56.1 (2.6)
13-60 36.9 35.1 (1.3) 49.8 (3.6) 35.7 (2.4)
61-120 30.5 40.1 (1.2) 14.9 (2.3) 5.7 (1.1)
>=121 15.0 20.6 (1.1) 3.2 (1.1) 2.5 (0.7)
Age at conception
<20 13.7 4.4 (0.6) 21.1 (2.8) 43.0 (2.3)
20-34 77.2 84.5 (1.0) 73.1 (3.0) 53.2 (2.4)
35-44 9.1 11.2 (0.9) 5.8 (1.5) 3.9 (0.8)
Race/ethnicity
Hispanic 15.5 14.5 (1.2) 21.0 (2.7) 15.4 (1.7)
Non-Hispanic black 12.9 5.2 (0.5) 17.8 (2.2) 37.8 (2.5)
Non-Hispanic white/other 71.7 80.4 (1.3) 61.2 (3.2) 46.8 (2.7)
Education at interview
<high school graduate 17.1 10.5 (0.9) 35.1 (3.5) 29.8 (1.9)
>= high school graduate 82.9 89.5 (0.9) 65.0 (3.5) 70.2 (1.9)
Age of father of child at conception†
<20 6.3 0.9 (0.3) 12.1 (2.4) 22.6 (2.0)
20-34 73.7 75.0 (1.2) 72.8 (3.1) 69.2 (2.2)
>= 35 20.1 24.1 (1.2) 15.1 (2.2) 8.2 (1.3)
Pregnancy intendedness†
Intended 69.3 79.9 (1.1) 59.0 (3.1) 37.5 (2.1)
Mistimed 21.4 12.8 (0.9) 27.7 (3.3) 48.9 (2.2)
Unwanted 9.0 7.2 (0.6) 13.0 (2.1) 13.1 (1.6)
Smoking during pregnancy†
Yes 16.7 13.8 (1.0) 30.6 (3.4) 18.7 (2.0)
No 83.3 86.2 (1.0) 69.5 (3.4) 81.3 (2.0)
Timing of first prenatal care visit†
First four months 94.4 96.0 (0.6) 93.5 (1.3) 89.4 (1.5)
Later/never 5.6 4.0 (0.6) 6.5 (1.3) 10.6 (1.5)
Site of most prenatal care visits†
Private MD/HMO 75.5 82.7 (1.3) 64.1 (3.0) 56.2 (2.7)
Clinic 21.2 14.5 (1.2) 31.0 (2.6) 39.7 (2.6)
Other 3.3 2.8 (0.4) 4.9 (1.5) 4.1 (0.9)
Payment for delivery
Private insurance 59.5 71.6 (1.5) 38.7 (3.5) 29.1 (2.4)
Medicaid/govt. assistance 33.1 19.6 (1.3) 57.6 (3.4) 66.5 (2.5)
All other 7.4 8.9 (0.9) 3.8 (1.1) 4.5 (1.0)
Infant birth order
1 38.4 31.3 (1.3) 39.1 (3.4) 63.4 (2.4)
2-3 52.3 58.7 (1.3) 49.6 (3.3) 30.5 (2.2)
>= 4 9.4 9.9 (0.8) 11.4 (1.6) 6.1 (1.1)
Low infant birth weight
Yes 4.6 3.9 (0.5) 6.2 (1.3) 6.2 (1.2)
No 95.4 96.1 (0.5) 93.8 (1.3) 93.8 (1.2)
Total 100.0 100.0 100.0 100.0
No. (in millions) 13.3 9.2 1.6 2.5
†Data for this variable were missing for some cases; missing data were not included in calculations of percentages. †Cases for which pregnancy intendedness was undetermined are included in the total. Note: All Ns are unweighted; all percentages are weighted.

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Table 2. Percentage distribution (and standard errors) of U.S. women aged 15-44 with a recent singleton birth, by selected characteristics, according to relationship duration at conception
Characteristic All Relationship duration (in months)
<=12 13-60 61-120 >=121
(N=2,578) (N=436) (N=908) (N=730) (N=355)
Relationship type at conception
Married 68.9 16.7 (2.2) 65.4 (1.8) 90.6 (1.1) 94.4 (1.1)
Cohabiting 12.1 21.4 (2.4) 15.8 (1.3) 5.7 (0.9) 2.5 (0.8)
Other 19.0 61.9 (3.0) 18.8 (1.6) 3.7 (0.7) 3.2 (0.8)
Age at conception
<20 13.7 42.6 (2.8) 15.5 (1.3) 0.7 (0.3) 0.0 (0.0)
20-34 77.2 54.7 (2.8) 78.1 (1.5) 90.8 (1.4) 74.2 (2.5)
35-44 9.1 2.7 (0.8) 6.4 (0.8) 8.5 (1.3) 25.8 (2.5)
Race/ethnicity
Hispanic 15.5 20.2 (2.2) 16.6 (1.6) 13.6 (1.3) 13.5 (2.4)
Non-Hispanic black 12.9 22.4 (2.1) 14.9 (1.4) 8.0 (0.9) 6.2 (1.0)
Non-Hispanic white/other 71.7 57.5 (2.7) 68.5 (1.9) 78.4 (1.5) 80.3 (2.4)
Education at interview
<high school graduate 17.1 33.8 (2.6) 16.7 (1.3) 9.5 (1.2) 13.6 (2.3)
>= high school graduate 82.9 66.2 (2.6) 83.3 (1.3) 90.5 (1.2) 86.4 (2.3)
Age of father of child at conception†
<20 6.3 22.1 (2.3) 6.2 (0.9) 0.0 (0.0) 0.0 (0.0)
20-34 73.7 70.2 (2.5) 80.1 (1.5) 79.6 (1.7) 49.6 (3.0)
>= 35 20.1 7.8 (1.4) 13.7 (1.3) 20.4 (1.7) 50.4 (3.0)
Pregnancy intendedness†
Intended 69.3 44.2 (2.7) 70.0 (1.8) 80.3 (1.4) 77.1 (2.3)
Mistimed 21.4 44.6 (2.5) 22.4 (1.6) 12.8 (1.3) 7.6 (1.4)
Unwanted 9.0 11.1 (1.6) 7.2 (0.9) 6.5 (0.9) 15.3 (2.1)
Smoking during pregnancy†
Yes 16.7 18.7 (2.4) 16.4 (1.4) 13.3 (1.4) 16.9 (2.0)
No 83.3 81.3 (2.4) 83.6 (1.4) 86.7 (1.4) 83.1 (2.0)
Timing of first prenatal care visit†
First four months 94.4 93.5 (1.2) 94.4 (0.8) 95.0 (1.0) 95.3 (1.4)
Later/never 5.6 6.5 (1.2) 5.6 (0.8) 5.0 (1.0) 4.7 (1.4)
Site of most prenatal care visits†
Private MD/HMO 75.5 62.4 (3.1) 74.5 (1.6) 80.4 (1.8) 83.6 (2.2)
Clinic 21.2 33.2 (2.9) 21.8 (1.5) 16.8 (1.7) 14.0 (2.1)
Other 3.3 4.4 (1.1) 3.7 (0.6) 2.8 (0.7) 2.4 (1.0)
Payment for delivery
Private insurance 59.5 34.6 (3.0) 55.4 (2.1) 73.6 (1.7) 75.1 (2.5)
Medicaid/govt. assistance 33.1 58.5 (3.2) 37.1 (2.0) 19.0 (1.6) 16.8 (2.3)
All other 7.4 6.9 (1.7) 7.6 (1.2) 7.4 (1.1) 8.1 (1.4)
Infant birth order
1 38.4 70.5 (2.5) 44.4 (2.0) 25.3 (1.8) 12.6 (2.0)
2-3 52.3 26.0 (2.4) 49.8 (2.0) 65.3 (1.8) 63.2 (2.8)
>= 4 9.4 3.5 (0.8) 5.8 (0.9) 9.4 (1.0) 24.1 (2.5)
Low infant birth weight
Yes 4.6 5.8 (1.3) 4.6 (0.6) 4.8 (1.0) 3.1 (1.0)
No 95.4 94.2 (1.3) 95.4 (0.6) 95.2 (1.0) 96.9 (1.0)
Total 100.0 100.0 100.0 100.0 100.0
No. (in millions) 13.3 2.2 4.6 3.8 1.9
†Data for this variable were missing for some cases; missing data were not included in calculations of percentages. †Cases for which pregnancy intendedness was undetermined are included in the total. Note: All Ns are unweighted; all percentages are weighted.

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Table 3. Percentage distribution (and standard errors) of U.S. women aged 15-44 with a recent singleton birth, by relationship type and duration at conception, according to race and ethnicity
Characteristic All† Non-Hispanic white Non-Hispanic black Hispanic
(N=2,578) (N=1,408) (N=568) (N=515)
Relationship type at conception
Married 68.9 77.2 (1.2) 27.6 (2.3) 64.6 (2.5)
Cohabiting 12.1 10.2 (0.9) 16.7 (1.9) 16.4 (2.0)
Other 19.0 12.7 (1.0) 55.7 (2.4) 19.0 (2.0)
Relationship duration at conception (in mos.)†
<=12 17.6 14.1 (1.0) 30.8 (2.4) 22.4 (2.5)
13-60 36.9 34.8 (1.3) 42.9 (2.6) 38.7 (2.8)
61-120 30.5 33.7 (1.2) 19.1 (2.1) 26.1 (1.8)
>=121 15.0 17.5 (1.0) 7.3 (1.2) 12.8 (1.9)
Total 100.0 100.0 100.0 100.0
No. (in millions) 13.3 8.9 1.7 2.1
†"All women" includes women of other races/ethnicities not shown separately. †Data for this variable were missing for a small number of cases; missing data were not included in calculations of percentages. Note: All Ns are unweighted; all percentages are weighted.

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Table 4. Adjusted odds ratios (and 95% confidence intervals) from logistic regression analysis of low birth weight in a woman's most recent singleton live birth, by characteristic, according to race and ethnicity
Characteristic All Non-Hispanic white Non-Hispanic black Hispanic
(N=2,356) (N=1,297) (N=505) (N=475)
Relationship type at conception
Married (ref) 1.0 1.0 1.0 1.0
Cohabiting 0.9 (0.5-1.7) 0.8 (0.3-2.1) 1.4 (0.5-3.8) 1.0 (0.2-4.7)
Other 0.6 (0.3-1.2) 0.1* (0.0-0.6) 1.5 (0.5-4.4) 5.7** (2.1-15.1)
Relationship duration at conception (in mos.)
<=12 1.6 (0.6-4.7) 4.8 (0.9-26.4) 0.9 (0.2-5.0) 0.1* (0.0-0.7)
13-60 1.4 (0.6-3.2) 2.4 (0.7-8.4) 1.1 (0.3-4.5) 0.2 (0.0-1.9)
61-120 1.9 (0.9-3.8) 3.1* (1.0-9.7) 1.4 (0.3-5.6) 0.4 (0.1-2.6)
>=121 (ref) 1.0 1.0 1.0 1.0
Age at conception
<20 0.7 (0.4-1.3) 0.7 (0.2-2.4) 0.8 (0.3-2.3) 0.6 (0.2-2.0)
20-34 (ref) 1.0 1.0 1.0 1.0
35-44 1.9 (0.9-4.0) 1.1 (0.3-4.1) 6.9** (2.1-22.4) 0.7 (0.1-7.1)
Race/ethnicity
Hispanic 1.3 (0.7-2.5) na na na
Non-Hispanic black 3.3*** (2.2-5.0) na na na
Non-Hispanic white/other (ref) 1.0 na na na
Education at interview
<high school graduate (ref) 1.0 1.0 1.0 1.0
>= high school graduate 1.1 (0.5-2.1) 1.0 (0.4-2.8) 1.4 (0.6-3.7) 1.1 (0.3-4.1)
Pregnancy intendedness
Intended (ref) 1.0 1.0 1.0 1.0
Mistimed 1.7* (1.0-2.8) 1.6 (0.8-3.5) 2.1 (0.9-5.1) 1.3 (0.5-3.8)
Unwanted 0.7 (0.3-1.5) 1.2 (0.3-4.0) 0.6 (0.2-1.8) 0.0*** (0.0-0.0)
Smoking during pregnancy
Yes 2.0** (1.3-3.3) 2.9** (1.6-5.3) 0.6 (0.2-2.0)
No (ref) 1.0 1.0 1.0
Site of most prenatal care visits
Private MD/HMO (ref) 1.0 1.0 1.0 1.0
Clinic 1.3 (0.8-2.2) 1.2 (0.5-3.2) 0.9 (0.5-1.8) 3.2 (0.8-12.0)
Other 2.8* (1.3-5.9) 4.3* (1.3-14.4) 1.9 (0.5-6.5) 2.5 (0.3-22.6)
Payment for delivery
Private insurance (ref) 1.0 1.0 1.0 1.0
Medicaid/govt. assistance 1.6 (0.9-2.8) 2.1 (0.9-5.0) 1.6 (0.8-3.1) 1.0 (0.3-4.0)
All other 0.9 (0.4-2.4) 1.3 (0.4-4.2) 0.4 (0.0-4.3) 0.5 (0.0-7.0)
Infant's birth order
1 1.8* (1.1-2.9) 2.3* (1.1-4.6) 1.1 (0.4-2.6) 1.3 (0.4-4.6)
2-3 (ref) 1.0 1.0 1.0 1.0
>= 4 2.3* (1.2-4.4) 3.4* (1.3-8.7) 2.5 (0.8-7.6) 0.4 (0.1-2.6)
*Statistically significant at p<.05. ** Statistically significant at p<.005. *** Statistically significant at p<.0005. †Although included in the model, maternal smoking was too rare among Hispanic women to produce statistically reliable estimates for this group. Notes: ref=reference group. na=not applicable. Age of father at conception and timing of first prenatal care visit were not included in the final logistic regression models because their unadjusted odds ratios were not statistically significant at p<.10. Ns are unweighted; all data are weighted. Odds ratio of 0.0 means that the odds ratio was less than 0.05.

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