Table 3.
Unadjusted Baseline and Follow-up Characteristics Among Pregnancy Groups for White and Black Females
| Characteristics by Race | Mean (SD) |
P Value | |||
|---|---|---|---|---|---|
| Nulligravidas | Nulliparous Gravidas | Primiparas | Multiparas | ||
| At Baseline, Age 9-10 ya | |||||
| White girls | |||||
| No. of participants | 739 | 82 | 74 | 12 | |
| Height, cm | 139.5 (6.9) | 140.6 (7.4) | 139.2 (6.8) | 137.0 (9.5) | .31 |
| Weight, kg | 34.9 (8.5) | 36.4 (9.3) | 35.8 (7.9) | 35.6 (8.0) | .39 |
| Body mass indexb | 17.8 (3.2) | 18.3 (3.6) | 18.4 (3.2) | 18.7 (2.7) | .21 |
| Waist circumference, cmc | 63.1 (8.1) | 63.6 (8.7) | 64.9 (8.1) | 66.1 (7.2) | .21 |
| Hip circumference, cmc | 78.9 (8.5) | 80.0 (9.1) | 80.8 (8.6) | 79.7 (8.3) | .20 |
| Waist to hip ratioc | 0.80 (0.044) | 0.79 (0.048) | 0.80 (0.042) | 0.83 (0.040) | .07 |
| Body fat % | 20.5 (7.3) | 20.7 (7.3) | 21.0 (7.1) | 20.8 (6.5) | .95 |
| Black girls | |||||
| No. of participants | 560 | 114 | 237 | 82 | |
| Height, cm | 143.0 (8.1) | 143.6 (7.6) | 142.4 (7.1) | 144.2 (8.0) | .26 |
| Weight, kg | 40.3 (11.6) | 39.0 (10.5) | 37.8 (8.5) | 39.8 (10.5) | .03 |
| Body mass indexb | 19.5 (4.3) | 18.7 (3.9) | 18.5 (3.3) | 18.9 (4.0) | .01 |
| Waist circumference, cmc | 67.2 (10.0) | 65.5 (9.2) | 65.3 (8.1) | 66.7 (8.8) | .04 |
| Hip circumference, cmc | 83.8 (10.8) | 82.5 (10.2) | 81.8 (8.9) | 84.1 (11.1) | .08 |
| Waist to hip ratioc | 0.80 (0.046) | 0.79 (0.045) | 0.80 (0.044) | 0.79 (0.039) | .13 |
| Body fat % | 22.5 (9.5) | 19.9 (8.0) | 20.4 (7.9) | 19.7 (8.6) | <.001 |
| At Follow-up, Age 18-19 yd | |||||
| White women | |||||
| No. of participants | 739 | 82 | 74 | 12 | |
| Height, cm | 165.7 (6.1) | 164.0 (6.8) | 162.9 (6.0) | 159.8 (7.9) | <.001 |
| Weight, kg | 65.3 (15.0) | 62.5 (15.1) | 68.9 (15.8) | 64.3 (13.3) | .06 |
| Body mass indexb | 23.7 (5.2) | 23.2 (5.2) | 26.0 (6.0) | 25.2 (4.8) | .002 |
| Waist circumference, cm | 74.2 (10.9) | 72.8 (11.0) | 79.6 (11.3) | 78.4 (9.4) | <.001 |
| Hip circumference, cm | 100.2 (9.9) | 98.3 (10.2) | 103.6 (11.2) | 99.1 (10.2) | <.01 |
| Waist to hip ratio | 0.74 (0.050) | 0.74 (0.043) | 0.76 (0.044) | 0.77 (0.054) | <.001 |
| Body fat % | 28.5 (9.9) | 27.2 (10.7) | 32.4 (11.4) | 31.8 (9.3) | .005 |
| Age at menarche, y | 12.8 (1.2) | 12.6 (1.2) | 12.2 (1.1) | 12.1 (0.6) | <.001 |
| Black women | |||||
| No. of participants | 560 | 114 | 237 | 82 | |
| Height, cm | 164.0 (6.2) | 164.7 (6.2) | 163.2 (6.3) | 163.3 (6.0) | .13 |
| Weight, kg | 72.4 (21.5) | 68.9 (18.3) | 72.4 (19.3) | 77.4 (22.0) | .06 |
| Body mass indexb | 26.9 (7.7) | 25.4 (6.5) | 27.1 (6.8) | 29.0 (8.1) | .01 |
| Waist circumference, cm | 78.6 (14.9) | 75.6 (12.2) | 80.0 (13.1) | 83.6 (12.9) | .001 |
| Hip circumference, cm | 104.0 (14.3) | 102.2 (12.1) | 104.2 (12.9) | 108.1 (15.3) | .04 |
| Waist to hip ratio | 0.75 (0.056) | 0.74 (0.049) | 0.77 (0.054) | 0.77 (0.054) | <.001 |
| Body fat % | 33.0 (13.6) | 31.4 (12.5) | 34.9 (13.7) | 36.2 (14.2) | .03 |
| Age at menarche, y | 12.0 (1.1) | 12.0 (1.1) | 12.1 (1.2) | 12.0 (1.1) | .70 |
a
Race by pregnancy group interaction: height, P = .43; weight, P = .04; hip circumference, P = .02; body mass index, P = .005; waist circumference, P = .01; and waist to hip ratio, P = .05.
b
Calculated as weight in kilograms divided by height in meters squared.
c
First measurement was at the second study visit (age, 10-11 years).
d
Race by pregnancy group interaction: height, P = .002; weight, P = .35; body mass index, P = .16; hip circumference, P = .13; waist circumference, P = .24; waist to hip ratio, P = .04; percent body fat, P = .75; and age at menarche, P = .001.