Table 3.
Follow-up pregnancy groups at end of follow-up |
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---|---|---|---|---|---|---|---|---|---|
P0 (0 pregnancies) n = 599 |
P1+ (1+ short pregnancies) n = 140 |
B1 (1 birth) n = 222 |
B2+ (2+ births) n = 186 |
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Baseline characteristics | n | % | n | % | n | % | n | % | p value |
Education | |||||||||
High school or less | 137 | 47.4 | 40 | 13.8 | 73 | 25.3 | 39 | 13.5 | 0.001 |
Some college | 212 | 53.5 | 54 | 13.6 | 81 | 20.5 | 49 | 12.4 | |
4 years college or more | 250 | 54.1 | 46 | 10.0 | 68 | 14.7 | 98 | 21.2 | |
Marital status | |||||||||
Never married | 514 | 55.8 | 120 | 13.0 | 168 | 18.2 | 119 | 12.9 | 0.001 |
Separated, divorced | 26 | 44.8 | 8 | 13.8 | 13 | 22.4 | 11 | 19.0 | |
Married | 59 | 35.1 | 12 | 7.1 | 41 | 24.4 | 56 | 33.3 | |
Smoking | |||||||||
Never | 381 | 52.8 | 71 | 9.9 | 143 | 19.8 | 126 | 17.5 | 0.07 |
Former | 84 | 52.5 | 26 | 16.3 | 30 | 18.8 | 20 | 12.5 | |
Current | 134 | 50.4 | 43 | 16.2 | 49 | 18.4 | 40 | 15.0 | |
Oral contraceptive (OC) use | |||||||||
Never | 221 | 66.4 | 32 | 9.6 | 46 | 13.8 | 34 | 10.2 | 0.001 |
Former | 210 | 47.8 | 71 | 16.2 | 86 | 19.6 | 72 | 16.4 | |
Current | 168 | 44.8 | 37 | 9.9 | 90 | 24.0 | 80 | 21.3 | |
Study center | |||||||||
Alabama | 108 | 49.3 | 19 | 8.7 | 57 | 26.0 | 35 | 16.0 | 0.001 |
Chicago | 125 | 51.2 | 13 | 5.3 | 45 | 18.4 | 61 | 25.0 | |
Minneapolis | 164 | 56.6 | 38 | 13.1 | 47 | 16.2 | 41 | 14.1 | |
Oakland | 202 | 51.3 | 70 | 17.8 | 73 | 18.5 | 49 | 12.4 | |
Mean | SD | Mean | SD | Mean | SD | Mean | SD | ||
|
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Height (cm) | 164.7 | 6.6 | 164.7 | 6.5 | 164.4 | 7.4 | 164.6 | 6.2 | 0.92 |
Weight (kg) | 64.5 | 14.3 | 64.5 | 14.7 | 63.4 | 14.5 | 62.4 | 11.0 | 0.29 |
BMI (kg/m2) | 23.8 | 4.9 | 23.8 | 5.4 | 23.5 | 4.8 | 23.1 | 4.0 | 0.34 |
Waist girth (cm) | 72.6 | 10.5 | 72.0 | 10.7 | 71.7 | 9.0 | 71.3 | 8.7 | 0.39 |
Age (years) | 24.7 | 3.7 | 23.9 | 3.4 | 24.2 | 3.6 | 24.7 | 3.6 | 0.07 |
Physical activity (intensity score)a |
328.0 | 347.0 | 302.5 | 297.0 | 299.5 | 310.0 | 364.5 | 309.0 | 0.20 |
Alcohol intake (ml/day)a | 2.4 | 9.7 | 4.8 | 11.1 | 2.4 | 9.6 | 2.7 | 12.1 | 0.11 |
Dietary carbohydrate (% kcal) |
48.0 | 7.1 | 46.6 | 6.8 | 47.2 | 7.7 | 47.2 | 7.3 | 0.13 |
Dietary fat (% kcal) | 36.1 | 6.0 | 37.0 | 6.0 | 36.9 | 6.4 | 36.6 | 5.8 | 0.17 |
Median (interquartile range); Kruskal-Wallis Test: nonparametric one-way tests used for physical activity and alcohol intake to assess differences among groups.