Table 2 .
Study group | Unadjusted models | Propensity adjusted models | |||||
---|---|---|---|---|---|---|---|
Hazard ratio (95% CI) for implant failure | Time ratio (95% CI) for implant survival | P value* | Hazard ratio (95% CI) for implant failure | Time ratio (95% CI) for implant survival | P value* | ||
Total population (n=41 995) | 0.41 (0.22 to 0.76) | 2.54 (1.34 to 4.83) | 0.004 | 0.54 (0.29 to 0.99) | 1.96 (1.01 to 3.82) | 0.047 | |
Population diagnosed with osteoarthritis (n=34 336) | 0.30 (0.13 to 0.70) | 3.47 (1.44 to 8.37) | 0.005 | 0.40 (0.17 to 0.93) | 2.69 (1.07 to 6.73) | 0.034 | |
Population undergoing knee arthroplasty (n=18 726) | 0.33 (0.12 to 0.88) | 2.79 (1.12 to 6.91) | 0.027 | 0.40 (0.15 to 1.07) | 2.37 (0.94 to 6.01) | 0.068 | |
Population undergoing hip arthroplasty (n=23 269) | 0.47 (0.24 to 0.94) | 2.36 (1.07 to 5.21) | 0.033 | 0.64 (0.32 to 1.28) | 1.71 (0.74 to 3.94) | 0.20 |
P values apply to both time ratios and hazard ratios.