Year Mean mortality Maximal mortality Number of countries of mortality>20 % (country number of mortality<=20/number of total countries) 1990-1991 304.5±334.2 2,000 121 17.7%(26/147)---① 2007-2008 305.9±334.5 1,600 120 28.6%(48/168)---② 2009-2010 330.3±305.5 1,200 78 22.0%(22/100) P (①--②)=0.02, significant difference. Others were insignificant difference.

Table 2: Comparison of numbers of countries with maternal mortality >20 in three periods.