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Table 4 Odds ratios (ORs) and 95% confidence intervals (CIs) for likelihood of maternal post-operative complication after Caesarean section with provider case volume categories – nonlinear volume effects (n = 20,914 patients)

From: Provider volume and maternal complications after Caesarean section: results from a population-based study

 Model 1aModel 2bModel 3c
OR95% CIOR95% conf. Int.OR95% CI
Provider annual volume (vs. 1–25)
 Provider years since graduation0.9650.9560.9750.9630.9540.9720.9660.9560.975
 Provider not specialized in maternal-fetal medicine or obstetrics & gynecology1.4461.0291.8641.4551.0261.8841.6181.1772.058
  1. aAdjusted for patient age, diabetes status, elective/urgent admission status, and comorbidity and annual dummy variables
  2. bAdjusted additionally for neighbourhood characteristics (income quintile and population size)
  3. cAdjusted additionally for hospital volume