Table I.
Summary and comparison of maternal factors in parity.
| Factors | Total population (n=560) | Primiparous (n=220) | Multiparous (n=340) |
|---|---|---|---|
| Age (years)a | 26.6±4.6 | 24.1±3.8 | 28.2±4.3g |
| Smokersb | 108 (19.3) | 51 (23.2) | 57 (16.8) |
| Number of cigarettes/day | 10.1±5.9 | 10.6±6.8 | 9.7±5.0 |
| Prepregnancy weight (kg)a | 53.7±9.0 | 52.8±8.8 | 54.3±9.0e |
| Height (cm)a | 158.8±5.5 | 159.1±5.2 | 158.6±5.7 |
| Prepregnancy BMIac (kg/m2) | 21.3±3.3 | 20.8±3.1 | 21.6±3.5f |
| BMI <18.5b | 85 (15.2) | 39 (17.7) | 46 (13.5) |
| BMI 18.5–25b | 405 (72.3) | 160 (72.7) | 245 (72.1) |
| BMI 25 to <30b | 53 (9.5) | 17 (7.7) | 36 (10.6) |
| BMI ≥30b | 17 (3.0) | 4 (1.8) | 13 (3.8) |
| Delivery weight (kg)a | 65.7±3.0 | 65.5±9.1 | 65.8±8.7 |
| Gestational weight gain (kg)a | 11.9±4.3 | 12.7±4.3 | 11.4±4.3f |
| Duration of pregnancy (weeks)a | 39.5±1.2 | 39.5±1.2 | 39.5±1.2 |
| 1 month postpartum weight (kg)ad | 58.4±8.2 | 58.1±8.5 | 58.6±8.1 |
| Postpartum weight loss (kg)ad | 7.3±2.3 | 7.6±2.3 | 7.1±2.3e |
Data are presented as the mean ± standard deviation, except where stated.
a
Compared using a two sample t-test;
b
Presented as a number and percentage and analyzed using a χ2 test;
c
Body mass index (BMI): Weight in kilograms divided by the square of the height in meters (kg/m2);
d
n=491;
e
P<0.05,
f
P<0.01 and
g
P<0.001 compared with primiparous females.