| Model 1a | Model 2b | Model 3c |
---|
OR | 95% CI | OR | 95% conf. Int. | OR | 95% CI |
---|
Provider annual volume (vs. 1–25) |
25–50 | 1.135 | 0.895 | 1.376 | 1.098 | 0.857 | 1.339 | 1.078 | 0.836 | 1.321 |
50–75 | 0.804 | 0.528 | 1.080 | 0.818 | 0.542 | 1.094 | 0.771 | 0.489 | 1.053 |
75+ | 0.802 | 0.458 | 1.146 | 0.851 | 0.506 | 1.196 | 0.762 | 0.404 | 1.120 |
Provider years since graduation | 0.965 | 0.956 | 0.975 | 0.963 | 0.954 | 0.972 | 0.966 | 0.956 | 0.975 |
Provider not specialized in maternal-fetal medicine or obstetrics & gynecology | 1.446 | 1.029 | 1.864 | 1.455 | 1.026 | 1.884 | 1.618 | 1.177 | 2.058 |
- aAdjusted for patient age, diabetes status, elective/urgent admission status, and comorbidity and annual dummy variables
- bAdjusted additionally for neighbourhood characteristics (income quintile and population size)
- cAdjusted additionally for hospital volume