Fig. 5

Differences in the MMR due to obstetric hemorrhage, amniotic fluid embolism, pregnancy-induced hypertension, heart disease and other medical complications in different periods. Differences in MMR due to obstetric hemorrhage, amniotic fluid embolism, pregnancy-induced hypertension, heart disease and other medical complications in different periods was analyzed with Chi-square test. The difference in obstetric hemorrhage, amniotic fluid embolism, gestational hypertension and other medical complications in different periods was statistically significant. (P = 0.009, P = 0.012, P = 0.021, P = 0.007,) There was no significant difference of heart disease in different periods. (P = 0.083)