Table 1 Characteristics of study populations
From: Cross sectional study in China: fetal gender has adverse perinatal outcomes in mainland China
| Â | Male infants (n = 60028) | Female infants (n = 49694) | Ratio | P |
|---|---|---|---|---|
n (%) | n (%) | |||
Maternal age (years) | 28 (25-31) | 28 (25-31) | Â | 0.48 |
≤24 | 13894 (23.3%) | 11371 (23.0%) | 1.22 | 0.24 |
25-34 | 39532 (66.4%) | 33249 (67.4%) | 1.19 | <0.001 |
≥35 | 6105 (10.3%) | 4736 (9.6%) | 1.29 | <0.001 |
Gravidity | 2 (1-2) | 1 (1-2) | - | <0.001 |
Parity | 1 (1-1) | 1 (1-1) | - | <0.001 |
Obesity | 8361 (17.1%) | 7109 (17.2%) | 1.18 | 0.07 |
Primiparous | 48176 (80.3%) | 41130 (82.8%) | 1.17 | <0.001 |