From: Cross sectional study in China: fetal gender has adverse perinatal outcomes in mainland China
 | Male infants (n = 60028) | Female infants (n = 49694) | Ratio | P |
---|---|---|---|---|
n (%) | n (%) | |||
Gestational age (GA) | Â | Â | Â | Â |
Mean GA (weeks) | 39 (38-40) | 39 (38-40) | - | <0.001 |
Preterm | 4381 (7.3%) | 3233 (6.5%) | 1.36 | <0.001 |
Term | 51576 (85.9%) | 43063 (86.7%) | 1.20 | <0.001 |
Postterm | 4071 (6.8%) | 3398 (6.8%) | 1.20 | 0.71 |
Neonatal outcome | Â | Â | Â | Â |
Birth weight (BW) | Â | Â | Â | Â |
Mean BW (g) | 3350 (3040-3640) | 3250 (2980-3520) | - | <0.001 |
<2500 g | 3548 (6.0%) | 3333 (6.8%) | 1.06 | <0.001 |
2500-4000 | 51628 (87.9%) | 43852 (89.0%) | 1.18 | <0.001 |
>4000 g | 4852 (8.3%) | 2509 (5.1%) | 1.93 | <0.001 |
Apgar < 7 at 5 min | 294 (0.5%) | 193 (0.4%) | 1.5 | <0.05 |
NICU | 624 (1.0%) | 455 (0.9%) | 1.37 | <0.05 |
Neonatal death | 241 (0.40%) | 124 (0.25%) | 1.94 | <0.01 |