Table 2.
Models including the coefficient per predictor per surgical outcome
| Variable | Surgical site infection | Venous thromboembolism | Postoperative bleeding | Luxation | Delirium | Nerve damage | ||||||
| Coefficient* | OR (95% CI) | Coefficient* | OR (95% CI) | Coefficient* | OR (95% CI) | Coefficient* | OR (95% CI) | Coefficient* | OR (95% CI) | Coefficient* | OR (95% CI) | |
| Intercept | −7.272 | – | −4.790 | – | −7.172 | – | −5.864 | – | −14.307 | – | −2.250 | – |
| Age (years) | 0.031 | 1.032 (1.005 to 1.059) |
−0.008 | 0.991 (0.966 to 1.018) |
0.033 | 1.034 (1.006 to 1.062) |
0.013 | 1.014 (0.991 to 1.038) |
0.127 | 1.137 (1.067 to 1.212) |
−0.051 | 0.949 (0.926 to 0.974) |
| Gender (male/female) | – | – | −0.168 | 0.844 (0.377 to 1.888) | – | – | – | – | – | – | −0.254 | 0.772 (0.319 to 1.868) |
| BMI (kg/m2) | −0.002 | 0.998 (0.937 to 1.063) |
– | – | 0.012 | 1.012 (0.954 to 1.073) | 0.021 | 1.023 (0.951 to 1.099) |
– | – | – | – |
| Obesity (yes/no) | – | – | 1.376 | 4.040 (1.462 to 11.159) |
– | – | – | – | – | – | – | – |
| Smoking status (yes/no) | 0.757 | 2.145 (0.883 to 5.213) |
– | – | −0.023 | 0.952 (0.336 to 2.701) | 0.491 | 1.667 (0.651 to 4.268) |
– | – | 0.572 | 1.754 (0.510 to 6.029) |
| Lung disease (yes/no) | – | – | – | – | – | – | – | – | – | – | – | – |
| Immunological disorder (yes/no) | 0.891 | 2.474 (1.186 to 5.158) |
– | – | – | – | – | – | – | – | – | – |
| Rheumatoid arthritis (yes/no) | – | – | – | – | – | – | 0.538 | 1.752 (0.408 to 7.530) |
– | – | – | – |
| Diabetes mellitus (yes/no) | 0.904 | 2.494 (1.125 to 5.529) |
0.829 | 2.317 (0.870 to 6.173) |
– | – | – | – | – | – | – | – |
| Liver disease (yes/no) | 2.345 | 10.659 (2.441 to 46.555) |
– | – | – | – | – | – | – | – | – | – |
| Heart disease (yes/no) | – | – | – | – | 0.729 | 2.086 (1.040 to 4.183) |
– | – | 0.348 | 1.422 (0.590 to 3.428) |
– | – |
| Disease of central nervous system (yes/no) | – | – | – | – | – | – | 0.106 | 1.113 (0.324 to 3.822) |
0.898 | 2.465 (0.936 to 6.490) |
– | – |
| Thromboembolic event (yes/no) | – | – | 1.501 | 4.586 (1.521 to 13.826) |
– | – | – | – | – | – | – | – |
| Dysplasia (yes/no) | – | – | – | – | – | – | – | – | – | – | −0.009 | 0.993 (0.217 to 4.552) |
| Vitamin K antagonist use (yes/no) | – | – | – | – | 0.787 | 2.220 (1.022 to 4.821) | – | – | – | – | – | – |
| NSAIDs (yes/no) | 0.619 | 1.877 (0.946 to 3.725) |
– | – | – | – | – | – | – | – | – | – |
To calculate the absolute risk for the surgical complications: P(surgical complication)=1/(1 + exp – linear part) × 100%. Linear part=intercept + (coefficients × variables).
*Adjustment for overfitting by shrinkage factor; the intercept was re-estimated.
BMI, body mass index; NSAIDs, non-steroidal anti-inflammatory drugs.