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Table 2 Distribution of maternal and neonatal variables in the studied population according to neonatal death, São Paulo State, Brazil, 2004–2013

From: Annual trend of neonatal mortality and its underlying causes: population-based study – São Paulo State, Brazil, 2004–2013

  Neonatal Death
  Yes ( n  = 48,309) No ( n  = 6,056,883)
Maternal age < 20 years 21 % 16 %
Maternal age ≥ 35 years 14 % 13 %
Unmarried mother 59 % 52 %
≤ 7 years of school 30 % 25 %
8–11 years of school 56 % 56 %
≥ 12 years of school 14 % 19 %
Primiparity 44 % 42 %
No prenatal visits 7 % 1 %
1–3 prenatal visits 19 % 4 %
4–6 prenatal visits 36 % 19 %
≥ 7 prenatal visits 37 % 75 %
Multiple gestation 10 % 2 %
Cesarean section 51 % 57 %
Non-hospital delivery 1 % 0.5 %
GA 22–27 weeks 33 % 0.2 %
GA 28–31 weeks 19 % 1 %
GA 32–36 weeks 20 % 8 %
GA 37–41 weeks 28 % 91 %
GA ≥ 42 weeks 0.4 % 0.8 %
Male 56 % 51 %
BW 400–999 g 38 % 0.2 %
BW 1000–1499 g 17 % 1 %
BW 1500–2499 g 20 % 8 %
BW 2500–2999 g 11 % 25 %
BW 3000–3999 g 13 % 62 %
BW ≥ 4000 g 1 % 4 %
1st minute Apgar 0–6 68 % 6 %
5th minute Apgar 0–6 40 % 1 %
Congenital malformations 27 % 1 %