Third, a multivariate hierarchical logistic regression was
performed using components of PPH management and
controlling by the variables significant in model 1. A critical
p value inferior to 5 % was used for significance (model 2).
Finally, a multivariate hierarchical logistic regression was
performed using organizational characteristics and controlling
by the variables significant in model 2 (model 3).
The relevant interactions between any two variables
were tested with the Wald test.