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Table 4 Epidemiological risk factors associated with deaths of infants up to 27 days after birth with perinatal asphyxia adjusted by year of death (Cox Regression), São Paulo State, Brazil: 2004–2013

From: Neonatal mortality associated with perinatal asphyxia: a population-based study in a middle-income country

  Hazard Ratio 95% CI
Death at same place of birth 1.57 1.43–1.7
Birth at Unified Health System hospital 0.92 0.86–0.99
Number of antenatal care visits
 0–3 1.16 1.07–1.25
 4–6 1.05 0.98–1.12
1st minute Apgar score
 0–1 1.49 1.33–1.67
 2–3 1.20 1.07–1.35
 4–6 1.09 0.97–1.22
Sex male 0.90 0.86–0.95
Gestational age x Delivery mode p = 0,006  
37–41 weeks
 Cesarean vs. Vaginal 1.01 0.93–1.11
22–27 vs. 37–41 weeks
 Vaginal 1.37 1.24–1.51
 Cesarean 1.12 0.99–1.26
28–31 vs. 37–41 weeks
 Vaginal 0.89 0.79–1.02
 Cesarean 0.77 0.69–0.87
32–36 vs. 37–41 weeks
 Vaginal 0.97 0.85–1.12
 Cesarean 0.83 0.75–0.93
≥ 42 vs. 37–41 weeks
 Vaginal 1.10 0.69–1.76
 Cesarean 1.91 1.27–2.87