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
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) |