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Table 2 Hazard ratio (95% confidence interval) of neonatal mortality rate with perinatal asphyxia according to year of birth and gestational age, considering the year of 2004 as a reference for each gestational age strata. São Paulo State, Brazil: 2004–2013

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

  Total 22–27 weeks 28–31 weeks 32–36 weeks 37–41 weeks
2004 1 (reference) 1 (reference) 1 (reference) 1 (reference) 1 (reference)
2005 0.943 (0.856–1.039) 1.058 (0.887–1.262) 0.788 (0.610–1.019) 0.831 (0.649–1.064) 0.923 (0.790–1.078)
2006 0.995 (0.901–1.098) 0.997 (0.829–1.198) 1.034 (0.809–1.323) 0.758 (0.584–0.984) 0.979 (0.836–1.148)
2007 0.907 (0.820–1.003) 0.881 (0.728–1.066) 0.916 (0.712–1.178) 0.808 (0.628–1.040) 0.898 (0.764–1.054)
2008 0.849 (0.766–0.940) 0.970 (0.806–1.168) 0.813 (0.626–1.057) 0.674 (0.517–0.879) 0.794 (0.672–0.937)
2009 0.798 (0.720–0.884) 0.827 (0.685–0.996) 0.759 (0.587–0.982) 0.547 (0.416–0.720) 0.795 (0.675–0.936)
2010 0.761 (0.686–0.844) 0.879 (0.730–1.057) 0.702 (0.538–0.916) 0.577 (0.441–0.753) 0.710 (0.593–0.830)
2011 0.667 (0.600–0.743) 0.677 (0.555–0.826) 0.636 (0.489–0.828) 0.541 (0.413–0.708) 0.633 (0.532–0.753)
2012 0.682 (0.613–0.758) 0.790 (0.651–0.959) 0.418 (0.318–0.548) 0.473 (0.363–0.615) 0.638 (0.535–0.760)
2013 0.684 (0.615–0.761) 0.715 (0.592–0.862) 0.609 (0.470–0.789) 0.366 (0.278–0.480) 0.575 (0.479–0.690)