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. Author manuscript; available in PMC: 2011 Jul 29.
Published in final edited form as: J Womens Health (Larchmt). 2005 Dec;14(10):917–928. doi: 10.1089/jwh.2005.14.917

Table 3.

Baseline Characteristics among Follow-Up Pregnancy Groups for Races Combined

Follow-up pregnancy groups at end of follow-up
P0
(0 pregnancies)
n = 599
P1+ (1+ short
pregnancies)
n = 140
B1
(1 birth)
n = 222
B2+
(2+ births)
n = 186

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

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
a

Median (interquartile range); Kruskal-Wallis Test: nonparametric one-way tests used for physical activity and alcohol intake to assess differences among groups.