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Table 3 Odds ratios (ORs) and 95% confidence intervals (CIs) for likelihood of maternal post-operative complication after Caesarean section (n = 20,914 patients)

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

 Model 1aModel 2Model 3
OR95% CIOR95% CIOR95% CI
 Provider case volume0.9950.9920.9990.9960.9921.0000.9950.9910.999
 Provider years since graduation0.9650.9560.9740.9620.9530.9720.9650.9560.975
 Provider not specialized in maternal-fetal medicine or obstetrics & gynecology1.4241.0061.8421.4431.0131.8721.5881.1492.026
 Patient age (years)0.9840.9691.0000.9870.9711.0030.9870.9711.003
 Diabetes in pregnancy0.9120.5931.2300.8840.5651.2030.8800.5611.200
 Admission category elective (vs. urgent)0.8000.5421.0580.8170.5581.0760.8300.5711.090
 Patient comorbidity (level vs. none)
 13.4203.1573.6833.4153.1523.6793.3973.1333.661
 21.6471.1682.1271.6661.1852.1461.6641.1832.145
 32.5171.9603.0742.6212.0633.1792.6162.0583.174
 44.8664.0855.6475.1484.3635.9325.0254.2395.810
 Missing/not applicable1.8461.1612.5311.8981.2122.5841.8961.2102.583
Neighbourhood income quintile (vs. lowest)
 Medium-low   1.0220.7641.2801.0250.7671.283
 Middle   0.9170.6491.1860.9180.6491.186
 Medium-high   0.8840.6121.1560.8830.6101.155
 Highest   0.8870.6171.1560.8800.6101.150
Community size ( vs. city (population 100,000-499,000))
 Small town (population 10,000-99,999)   1.8391.6172.0621.8441.6222.066
 rural area (population < 10,000)   1.4661.2461.6861.5081.2881.729
 Hospital mean annual C-Section volume      1.0011.0001.002
  1. aAll regression models adjust for the listed variables and for a set of dummy variables for each year of the data period (2004–2014)