With the exception of the widening of the gender disparity in the IBD from 2000 to 2013, the development trends observed for gender disparity (Slope BGV = -0.06, Slope T = -0.21) in the U5MR and NMR were relatively stable (Slope BGV = -0.01, Slope T = 0.23). The BGV and T ranges for the IBD in the analysis stratified by gender from 2000 to 2013 were [38.875, 299.463] and [1.675, 6.595], respectively. The BGV and T ranges for the U5MR were [0.640, 4.000] and [0.210, 6.855], respectively. Finally, the BGV and T ranges for the NMR were [0.023, 1.102] and [0.025, 3.255], respectively. The gender disparity in IBD was largest in 2013 (T = 6.225), whereas the gender disparity in NMR was the lowest (T = 3.255) (Fig. 3).Fig. 3Gender disparity trends in China’s maternal and child health outcomes from 2000 to 2013