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Table 1 Characteristics of study population by GA at birth and selected maternal and neonatal variables

From: ‘The influence of gestational age and socioeconomic status on neonatal outcomes in late preterm and early term gestation: a population based study’

GA total 34 35 36 37 38 39 40 41
n 25312 276 457 801 1780 4189 6535 7218 4056
Maternal Characteristics
maternal age group, years <19 5.1 5.8 3.5 4.2 4.9 4.4 5.4 5.1 5.5
>34 12.9 13.8 15.3 17.7 16.1 15.1 12.4 11.4 11.2
primiparous, % 38.1 44.2 39.6 36.6 35.7 32.5 35.1 39.4 46.8
caesarean section, % 20.8 35.9 33.7 29.0 24.9 30.1 21.2 13.9 17.2
induced delivery, % 26.8 26.8 35.2 35.0 33.7 34.8 22.1 16.4 39.1
multiple gestation, % 2.2 23.6 21.9 11.7 8.0 2.7 0.3 0.2 0.0
maternal diabetes, % 4.8 7.6 12.0 17.2 10.1 8.5 3.8 2.4 0.8
low SES, % 32.4 35.9 37.2 39.3 36.8 33.6 31.8 31.2 30.4
breastfed, % 81.6 68.8 69.4 73.9 79.2 80.5 81.3 83.2 85.3
rural, % 44.2 34.8 42.2 41.3 39.6 43.3 42.9 47.8 44.3
Newborn Characteristics
male, % 51.2 58.0 55.4 54.2 51.7 53.0 49.6 50.1 51.9
mean BW, grams (SD)   2377 (460) 2640 (534) 2936 (530) 3143 (480) 3358 (479) 3496 (459) 3656 (463) 3774 (469)
BW range, grams   1184-3902 1216-4599 1420-5160 1172-5305 1610-6440 1703-6457 1349-5589 1438-5795
Large for GA, % 14.9 12.7 15.3 16.7 15.4 15.6 14.1 15.0 14.9
Small for GA, % 7.5 7.3 8.5 8.9 7.5 7.3 8.0 7.0 7.2
resuscitation at birth, % 7.6 31.2 20.1 12.2 9.2 7.3 5.5 6.7 7.9
median LOS, days (range) 2 (1-168) 13 (1-90) 6 (1-66) 3 (1-71) 2 (1-103) 2 (1-168) 2 (1-93) 2 (1-55) 2 (1-42)
major congenital anomaly, % 2.5 10.1 5.7 5.6 3.2 3.1 2.1 1.7 2.1
  1. Legend: SES = socioeconomic status, BW = birthweight, CS = caesarean section, LOS = length of stay.
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