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Table 3 Multilevel multinomial regression analyses for minor surgery and referral in comparison to no treatment

From: Minor surgery in general practice and effects on referrals to hospital care: Observational study

  Laceration/cut Benign neoplasm skin/nevus Sebaceous cyst
  Empty model Adjusted model Empty model Adjusted model Empty model Adjusted model
  Minor surgery Referral Minor surgery Referral Minor surgery Referral Minor surgery Referral Minor surgery Referral Minor surgery Referral
  Intercept (SE) Intercept (SE) Intercept (SE) Intercept (SE) Intercept (SE) Intercept (SE)
  -2.18 (0.18) - 10.2% -4.74 (0.22) - 0.9% -2.05 (0.15) 11.4% -4.82 (0.23) 0.8% -0.94 (0.12) 28.1% -2.01 (0.13) 11.8% -0.80 (0.10) 31.0% -1.82 (0.12) 13.9% -0.87 (0.09) 29.5% -2.26 (0.12) 9.4% -0.89 (0.09) 29.1% -2.26 (0.12) 9.4%
    OR (95% CI)    OR (95% CI)    OR (95% CI)
Gender, female    0.85 (0.72-1.01) 1.23 (0.68-2.20)    0.94 (0.85-1.05) 1.13 (0.96-1.33)    0.62 (0.53-0.73) 0.76 (0.58-0.99)
Age    1.01 (1.01-1.01) 1.01 (1.00-1.02)    1.01 (1.01-1.01) 0.99 (0.99-1.00)    1.01 (1.01-1.02) 1.00 (0.99-1.01)
Distance to hospital    1.00 (1.00-1.00) 1.00 (1.00-1.00)    1.00 (1.00-1.00) 1.00 (1.00-1.00)    1.00 (1.00-1.00) 1.00 (1.00-1.00)
Primary care nurse    1.69 (0.96-2.99) 1.66 (0.64-4.28)    1.49 (1.06-2.09) 1.43 (0.93-2.18)    1.03 (0.71-1.49) 1.32 (0.80-2.18)
Workload    1.00 (1.00-1.00) 1.00 (1.00-1.00)    1.00 (1.00-1.00) 1.00 (1.00-1.00)    1.00 (1.00-1.00) 1.00 (1.00-1.00)
  Variance (SE) Variance (SE) Variance (SE) Variance (SE) Variance (SE) Variance (SE)
Between GP practice variance 1.25(0.30) 0.76 (0.41) 0.80 (0.21) 0.74 (0.40) 0.57 (0.13) 0.67 (0.16) 0.40 (0.09) 0.51 (0.13) 0.32 (0.09) 0.38 (0.14) 0.27 (0.08) 0.33 (0.13)
Covariance -0.26 (0.27) -0.29 (0.22) 0.11 (0.10) -0.12 (0.08) -0.11 (0.08) -0.13 (0.07)
  Correlations Correlations Correlations Correlations Correlations Correlations
Correlation GP practice variances 'therapy groups'a -0.27 (-0.51 - 0.02) -0.38 (-0.60- -0.11) 0.18 (-0.44--0.11) -0.26 (-0.506 - 0.03) -0.31 (-0.55 - -0.03) -0.42 (-0.63 - -0.16)
ICC 27.5 18.7 19.6 18.3 14.9 16.8 10.8 13.5 8.7 10.3 7.7 9.2
95% range on GP practice 1.6-44.3% 0.2-3.4% 3.1-34.4% 0.2-2.9% 7.2-66.3% 2.3-43.1% 13.7-55.9% 4.5-35.5% 14.6-49.3% 3.6-22.4% 16.5-46.1% 4.2-20.0%
  1. *Based on multilevel multinomial regression analyses for minor surgery and referral rate in comparison to no treatment in care-episodes of laceration/cut, benign neoplasm skin/nevus and sebaceous cyst.
  2. a This is the correlation between the variances of the two defined therapy groups (minor surgery and referral) at GP level
  3. b because we used nominal data the variance at the lowest level (episodes) is not determined but given by π2/3
  4. c calculated by intercept plus and minus 1.96 times the square root of the between practice variation and transformed back from a logit scale).