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Table 1 Clinical and demographic characteristics of infants with and without RDS

From: Analysis of nitric oxide synthase gene polymorphisms in neonatal respiratory distress syndrome among the Chinese Han population

  Control group (n = 227) RDS group (n = 189) P value
Gestational age (weeks) 35.1 ± 2.0 32.2 ± 2.5 0.000
Birth weight (g) 2388 ± 625 1813 ± 504 0.000
Gender (male/female) 123/104 118/71 0.090
Apgar score (5th min) 8.1 ± 1.3 4.3 ± 1.2 0.000
Mode of delivery (V/CS) 108/119 76/113 0.132
Maternal age (years) 27.7 ± 5.4 29.0 ± 5.6 0.225
PROM >18 hours 71/156 63/126 0.655
Use of antenatal steroid 39/188 44/145 0.121
Use of surfactant 158/69 147/42 0.061