Table 2.
Final model regression coefficients and subdistribution hazard ratios.
| Predictors | Regression coefficient from Fine & Gray competing risk model (95% CI) | Subdistribution hazard ratio (SHR) (95% CI) |
|---|---|---|
| Age (per unit increase), years | 0.51 (0.49–0.53) | 1.66 (1.63–1.70) |
| Age2 | −0.0039 (−0.0040 to −0.0037) | 0.9962 (0.9960–0.9963) |
| Prescribing of OA medications (yes) | 0.41 (0.37–0.44) | 1.50 (1.45–1.56) |
| Count of chronic conditions from CCI (per unit increase) | −0.14 (−0.16 to −0.12) | 0.87 (0.85–0.89) |
| Mental health condition (yes) | −0.14 (−0.18 to −0.10) | 0.87 (0.83–0.90) |
| Previous TKR (yes) | 0.97 (0.91–1.02) | 2.63 (2.49–2.77) |
| Past knee surgery (excluding TKR) (yes) | 0.93 (0.87–0.99) | 2.54 (2.39–2.69) |
Abbreviations: CI = confidence interval; SHR = subdistribution hazards ratio from competing risk model; OA = osteoarthritis; CCI=Charlson Comorbidity Index; TKR = total knee replacement.
Note: Subdistribution hazard ratio obtained by exponentiating the regression coefficient from the Fine & Gray competing risk model.