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Table 1 Characteristics of study populations

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 (%)
Maternal age (years) 28 (25-31) 28 (25-31)   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
  1. 835 missing cases for maternal ages; 19578 missing cases for maternal weight and height.
  2. Quantitative variables are expressed as median (25th percentile–75th percentile).