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Table 3 Multivariable logistic regression models for Norwegian GPs claiming reimbursement for minor surgery, major surgery and IUD-insertions in 2013

From: Practice variation in surgical procedures and IUD-insertions among general practitioners in Norway – a longitudinal study

  Minor surgery Major surgery IUD-insertiona
(OR 95% CI) (OR 95% CI) (OR 95% CI)
GP gender
 Male (ref) 1 1 1
 Female 0.58 (0.45–0.74) 0.38(0.32–0.45) 6.28 (4.47–8.82)
GP age
  < =40 (ref) 1 1 1
 41–50 0.68 (0.46–1.02) 0.86(0.68–1.10) 1.17 (0.98–1.49)
 51–60 0.55 (0.38–0.81) 0.68(0.54–0.87) 1.10 (0.88–1.38)
  > 60 0.33 (0.22–0.48) 0.46(0.36–0.60) 0.92 (0.73–1.17)
GP list size
  < 1000 (ref) 1 1 1
 1001–1200 0.97 (0.68–1.39) 1.21(0.97–1.52) 1.82 (1.42–2.39)
 1201–1500 0.92 (0.66–1.28) 1.44(1.15–1.79) 1.78 (1.39–2.28)
  > 1500 1.09 (0.73–1.62) 1.74(1.32–2.30) 2.46 (1.85–3.26)
GP municipal size
  < 5000 (ref) 1 1 1
 5001–10,000 2.74 (1.50–5.01) 0.91(0.63–1.32) 1.41 (1.02–1.94)
 10.001–25.000 1.88(1.16–3.03) 0.84(0.60–1.17) 1.65 (1.23–2.21)
 25.001–100.000 1.24 (0.80–1.93) 0.55(0.40–0.76) 1.06 (0.80–1.41)
  > 100.000 0.65 (0.42–1.00) 0.39(0.28–0.54) 1.02 (0.76–1.37)
  1. aAdjusted for the interaction term gender x list size. This interaction is outlined in Fig. 1