highly significantp <0.001
A chi-square test for trend showed a highly significant increase in PPH rates across the four risk strata ( p <0.001 for trend).
A chi-square test for trend showed a highly significant increase in PPH rates across the four risk strata ( p <0.001 for trend).
Consequently, 70.0% of PPH cases were in preterm deliveries (<37 weeks) compared to 50.0% preterm among those without PPH (this difference approached significance, p =0.067).