Table 4. Associations between error count for PPH management and staff and institutional factors.

Vignette 1 –multivariate analysis.

	IRR [95% CI]	P-value
Staff factors
Age (10 years)	1.19 [1.09 ; 1.29]	<0.001
Full-time practice	0.83 [0.71 ; 0.97]	0.020
Level of risk taking (high and moderate)	1.41 [1.19 ; 1.67]	<0.001
Unit/institutional factors
Mortality and morbidity reviews *	0.80 [0.64 ; 0.99]	0.037
Births/midwife ratio (100 births) if no MMRs *	1.09 [0.97 ; 1.22]	0.141
Births/midwife ratio (100 births) if MMRs *	0.93 [0.89; 0.97]	0.001

* Interaction between births/midwife ratio and MMRs: 0.85 [0.75; 0.96], P = 0.011