Table II.
Effectiveness of the model osteoarthritis consultation on the primary outcome measure (SF-12 PCS) compared to usual primary care for osteoarthritis
| SF-12 PCS | Intervention |
Control |
∗Mean difference (95% CI) | †Effect size (95% CI) | P-value | ||||
|---|---|---|---|---|---|---|---|---|---|
| Valid n | Mean | SD | Valid n | Mean | SD | ||||
| Post-consultation | 280 | 36.49 | 11.48 | 231 | 36.48 | 11.00 | – | – | – |
| 3 months | 250 | 38.03 | 12.32 | 204 | 38.12 | 11.58 | −0.29 (−1.86, 1.29) | −0.03 (−0.17, 0.11) | 0.722 |
| 6 months | 229 | 38.99 | 12.12 | 180 | 38.89 | 12.00 | −0.37 (−2.32, 1.57) | −0.03 (−0.21, 0.14) | 0.706 |
| 12 months | 200 | 38.79 | 12.58 | 166 | 39.22 | 11.84 | −0.90 (−3.75, 1.96) | −0.08 (−0.33, 0.17) | 0.539 |
ICC: 0.006 (unadjusted); <0.001 (adjusted for baseline score).
∗
Calculated as mean difference for Intervention group – control group by linear mixed modelling adjusted for age, gender, practice size and baseline SF-12 PCS (clustering by general practice accounted for in the mixed model).
†
Mean difference relative to pooled ‘baseline’ (post-consultation) SD.