Table III.
Predictors of Short-Form 36 (SF-36) Total Physical Score at six and 12 months post-operatively using linear mixed models (n = 198). Statistically significant p-values are bolded (CI, confidence interval)
| Six months | 12 months | ||||
|---|---|---|---|---|---|
| Predictor | Coefficient (95% CI) | p-value | Coefficient (95% CI) | p-value | |
| Constant | 44.19 | - | 44.88 | - | |
| Age | -0.01 (-0.10 to 0.09) | 0.871 | -0.01 (-0.10 to 0.09) | 0.916 | |
| Female | 1.63 (-0.34 to 3.61) | 0.104 | 0.98 (-1.03 to 3.00) | 0.338 | |
| Body mass index | 0.15 (-0.02 to 0.33) | 0.091 | 0.14 (-0.04 to 0.32) | 0.132 | |
| ENRICHD Social Support score | -0.08 (-0.26 to 0.09) | 0.360 | -0.09 (-0.27 to 0.09) | 0.335 | |
| Previous joint surgery | -2.98 (-5.07 to -0.88) | 0.006 | -2.71 (-4.85 to -0.57) | 0.013 | |
| Involved in decision | -1.18 (-3.18 to 0.82) | 0.247 | -1.07 (-3.11 to 0.97) | 0.301 | |
| Any comorbidities | -1.72 (-4.00 to 0.56) | 0.138 | -1.12 (-3.45 to 1.21) | 0.344 | |
| Any complications | -1.43 (-1.43 to 3.55) | 0.402 | 0.37 (-2.20 to 2.94) | 0.778 | |
| Taking opioids | -1.94 (-3.92 to 0.03) | 0.054 | -1.39 (-3.41 to 0.63) | 0.176 | |
| Taking NSAIDs or COX-2 inhibitors | 2.41 (0.55 to 4.27) | 0.012 | 2.64 (0.73 to 4.54) | 0.007 | |
| HADS anxiety score at baseline | 0.28 (0.02 to 0.54) | 0.034 | 0.38 (0.12 to 0.64) | 0.004 | |
| HADS depression score at baseline | -0.56 (-0.56 to -0.16) | 0.001 | -0.65 (-0.98 to -0.31) | < 0.001 | |
| WOMAC pain score at baseline | -1.19 (-1.48 to -0.91) | < 0.001 | -1.28 (-1.57 to -0.99) | < 0.001 | |
| SF-36 Total Physical Score over time | -11.42 (-12.82 to -10.03) | < 0.001 | -12.19 (-13.64 to -10.75) | < 0.001 | |
* NSAIDs, non-steroidal anti-inflammatory drugs; HADS, Hospital Anxiety and Depression Scale; WOMAC, Western Ontario and McMaster Universities osteoarthritis index; SF-36, Short-Form 36