Statistical analysis
Means and standard deviations were used to summarise normally
distributed variables and compared using a t-test, while medians and
interquartile ranges were used and compared using a Mann-Whitney U test
for non-normally distributed variables. Categorical variables were
summarised as counts and percentages, and compared using a Chi-squared
test. To explore the association between APH and the various obstetrics
outcomes, we used logistic, negative binomial and Poisson regression as
appropriate. All analyses were conducted using STATA version 15.1 (Stata
Corporation, College Station, Texas, USA).