Table 1 Demographic and reproductive characteristics of study population by pregnancy-induced hypertension, Suzhou, China, 1989–1990
From: Pregnancy-induced hypertension and infant growth at 28 and 42 days postpartum
| Â | Subjects | Â | Â | Â | Â | Â | |
|---|---|---|---|---|---|---|---|
Characteristics* | No. | % | Normotensive (N=10,669) % | Gestational hypertension (N=782) % | Preeclampsia (N=365) % | Severe preeclampsia (N=105) % | Statistical significance (χ2test) |
Maternal age | Â | Â | Â | Â | Â | Â | Â |
≤30 | 11,230 | 94.2 | 94.6 | 90.3 | 91.5 | 94.3 | 0.000 |
> 30 | 691 | 5.8 | 5.4 | 9.7 | 8.5 | 5.7 | Â |
Parity | Â | Â | Â | Â | Â | Â | Â |
Nulliparous | 11,365 | 95.3 | 95.3 | 94.9 | 97.8 | 97.1 | 0.100 |
Multiparous | 556 | 4.7 | 4.7 | 5.1 | 2.2 | 2.9 | Â |
Sex | Â | Â | Â | Â | Â | Â | Â |
Male | 6,026 | 50.5 | 50.8 | 48.6 | 47.4 | 55.2 | 0.290 |
Female | 5,895 | 49.5 | 49.2 | 51.4 | 52.6 | 44.8 | Â |
Preterm birth (<37 weeks) | Â | Â | Â | Â | Â | Â | Â |
No | 11,527 | 96.7 | 96.6 | 98.2 | 96.7 | 93.3 | 0.023 |
Yes | 394 | 3.3 | 3.4 | 1.8 | 3.3 | 6.7 | Â |
Low birth weight (<2,500 g) | Â | Â | Â | Â | Â | Â | Â |
No | 11,620 | 97.5 | 97.6 | 97.3 | 95.1 | 92.4 | 0.000 |
Yes | 301 | 2.5 | 2.4 | 2.7 | 4.9 | 7.6 | Â |
Mean gestational age (Weeks) | 39.30 | Â | 39.29 | 39.44 | 39.30 | 38.69 | 0.000 (Analysis of variance) |
Place of delivery | Â | Â | Â | Â | Â | Â | Â |
Hospital | 11,900 | 99.8 | 99.8 | 99.7 | 100 | 100 | 0.981 |
Home | 11 | 0.1 | 0.1 | 0.1 | 0 | 0 | Â |
BMI | Â | Â | Â | Â | Â | Â | Â |
< 24 | 11,012 | 92.8 | 93.1 | 90.0 | 89.6 | 93.3 | 0.005 |
24–28 | 426 | 3.6 | 3.4 | 5.3 | 5.8 | 4.8 |  |
> 28 | 432 | 3.6 | 3.5 | 4.7 | 4.6 | 1.9 | Â |
Infant complications No Yes | Â | Â | Â | Â | Â | Â | Â |
No | 10,989 | 93.1 | 93.1 | 90.9 | 87.0 | 88.5 | 0.000 |
Yes | 810 | 6.9 | 6.4 | 9.1 | 13.0 | 11.5 | Â |