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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

  Subjects      
Characteristics* No. % Normotensive (N=10,669) % Gestational hypertension (N=782) % Preeclampsia (N=365) % Severe preeclampsia (N=105) % Statistical significance (χ2test)
Maternal age        
≤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  
Parity        
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  
Sex        
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  
Preterm birth (<37 weeks)        
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  
Low birth weight (<2,500 g)        
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  
Mean gestational age (Weeks) 39.30   39.29 39.44 39.30 38.69 0.000 (Analysis of variance)
Place of delivery        
Hospital 11,900 99.8 99.8 99.7 100 100 0.981
Home 11 0.1 0.1 0.1 0 0  
BMI        
< 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  
Infant complications No Yes        
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  
  1. * Excluding cases with missing information.