Meta-analysis for predelivery hemoglobin level and its association with severe PPH/PPH. (A) Forest plot of the MD with a 95% CI for predelivery hemoglobin level between women with severe PPH and controls. (B) Forest plot of the MD with a 95% CI for predelivery hemoglobin level between women with PPH and controls. (C) Forest plot of the MD with a 95% CI for predelivery hemoglobin level between women with PPH (per WHO definition only) and controls.