Meniscus DRG 222O and ICD M232 | Carpal tunnel syndrome DRG 6O and ICD G56O | Benign breast hypertrophy DRG 261O and ICD N62 | Hallux valgus DRG 225O and ICD M201 | |||||
Adjusted OR | CI | Adjusted OR | CI | Adjusted OR | CI | Adjusted OR | CI | |
Male | 1.002 | 0.954 to 1.053 | 1.027 | 0.911 to 1.159 | 0.118* | 0.089 to 0.157 | 1.020 | 0.694 to 1.500 |
CCI>0 | 0.947 | 0.849 to 1.055 | 0.838* | 0.711 to 0.987 | 0.619* | 0.388 to 0.989 | 0.701 | 0.426 to 1.153 |
HPY | 0.667* | 0.613 to 0.726 | 0.760* | 0.651 to 0.888 | 0.442* | 0.320 to 0.610 | 0.970 | 0.655 to 1.436 |
Age group 18–49 years† | 0.802* | 0.748 to 0.861 | 1.292* | 1.082 to 1.542 | 1.252 | 0.889 to 1.764 | 1.023 | 0.719 to 1.456 |
Age group 50–59 years | 0.916* | 0.862 to 0.974 | 1.152 | 0.977 to 1.359 | 1.024 | 0.719 to 1.459 | 1.271 | 0.935 to 1.728 |
Age group 60–69 years | ref | ref | ref | ref | ref | ref | ref | ref |
Age group 70–79 years | 1.132* | 1.059 to 1.210 | 1.124 | 0.957 to 1.320 | 0.969 | 0.627 to 1.500 | 0.891 | 0.650 to 1.222 |
Age group≥80 years | 1.282* | 1.155 to 1.424 | 1.090 | 0.927 to 1.281 | 0.315* | 0.156 to 0.636 | 0.748 | 0.483 to 1.157 |
Primary and lower secondary school‡ | 0.869* | 0.809 to 0.933 | 0.842* | 0.715 to 0.991 | 0.785 | 0.557 to 1.106 | 0.774 | 0.556 to 1.077 |
Upper secondary school | 0.975 | 0.920 to 1.032 | 0.926 | 0.801 to 1.070 | 0.690* | 0.512 to 0.930 | 0.975 | 0.749 to 1.268 |
Undergraduate | ref | ref | ref | ref | ref | ref | ref | ref |
Graduate | 0.847* | 0.774 to 0.928 | 1.014 | 0.774 to 1.327 | 0.629 | 0.347 to 1.139 | 1.016 | 0.665 to 1.555 |
Income≤NOK 199 999§ | 0.886* | 0.807 to 0.973 | 0.895 | 0.673 to 1.190 | 0.683* | 0.479 to 0.974 | 0.738 | 0.482 to 1.129 |
Income NOK 200–399 999 | 0.985 | 0.927 to 1.046 | 1.003 | 0.887 to 1.135 | 0.930 | 0.710 to 1.218 | 1.181 | 0.908 to 1.535 |
Income NOK 400–599 999 | ref | ref | ref | ref | ref | ref | ref | ref |
Income NOK 600–799 999 | 1.102* | 1.021 to 1.190 | 1.020 | 0.804 to 1.295 | 0.733 | 0.401 to 1.341 | 0.735 | 0.455 to 1.188 |
Income≥NOK 800 000 | 1.019 | 0.916 to 1.134 | 0.855 | 0.580 to 1.261 | 1.480 | 0.537 to 4.080 | 1.008 | 0.465 to 2.185 |
Fixed effects | MA¶/Year | MA¶/Year | MA¶/Year | MA¶/Year | ||||
Per cent concordant | 67.9 | 71.3 | 88.3 | 78.0 | ||||
AIC | 43 277.478 | 8918.933 | 2336.609 | 2083.879 |
Correlations (Pearson Correlation Coefficient analysis) between independent variables were tested for each of the four procedures. The range of correlation were from −0.18 to 0.441, indicating that multicollinearity is not a significant problem.
*Significant result.
†Age was divided into five groups: age group 0 included patients aged 18–49 years, age group 1 included patients aged 50–59 years and then 10-year interval groups up to age group 5, which covered all patients aged 80 years and above.
‡Education was divided into four groups: individuals who completed lower secondary school; individuals who completed upper secondary school prior to 1974/1975, regardless of schooling duration; individuals who completed a tertiary degree up to 4 years in duration, prior to 1998/1999 and individuals who completed a postgraduate tertiary degree (the majority of which were 5 years or longer in duration).
§Income was divided into five groups: income≤NOK 199 999, income NOK 200–399 999, income NOK 400–599 999, income NOK 600–799 999 and income≥NOK 800 000.
¶Metropolitan area.
AIC, Akaike information criterion; CCI, Charlson Comorbidity Index; HPY, hospitalisation the previous year; ICD, International Statistical Classification of Diseases and Related Health Problems; NP, non-profit; PFP, private for-profit.