Results from post hoc regression model predicting secondary surgery within 2 and 5 years for the full cohort
| Covariate | 2-year follow-up | 5-year follow-up | ||
|---|---|---|---|---|
| OR (95% CI) | p value | OR (95% CI) | p value | |
| Age | ||||
| 40–49 v. 19–39 yr | 2.68 (1.70–4.22) | < 0.001 | 2.82 (1.87–4.25) | < 0.001 |
| 50–60 v. 19–39 yr | 4.39 (2.67–7.22) | < 0.001 | 3.44 (2.11–5.62) | < 0.001 |
| Sex (male v. female) | 0.77 (0.52–1.15) | 0.20 | 1.05 (0.73–1.51) | 0.79 |
| Osteoarthritis | 2.41 (1.39–4.20) | 0.002 | 1.76 (1.00–3.09) | 0.049 |
| Surgeon years of experience | 1.01 (0.97–1.05) | 0.68 | 1.00 (0.96–1.04) | 0.82 |
| Surgeon annual volume | 1.00 (0.99–1.00) | 0.18 | 1.00 (1.00–1.00) | 0.99 |
CI = confidence interval; OR = odds ratio.