Table 2. Results of Logistic Regression Models: Odds of Improvement of 5 Points or More in PCS.
| Characteristic at visit 8a | Odds ratio (95% CI) | |||
|---|---|---|---|---|
| Model with full cohort, primary model | Tertile 1 (PCS <49.4) | Tertile 2 (PCS 49.4-55.7) | Tertile 3 (PCS >55.7) | |
| No. | 1807 | 602 | 602 | 603 |
| Age | 0.96 (0.91-1.02) | 0.94 (0.88-1.00) | 0.98 (0.97-1.09) | 1.07 (0.80-1.41) |
| No sleep disturbance | 1.43 (1.05-1.96) | 1.58 (1.10-2.29) | 1.04 (0.56-1.95) | 3.35 (0.60-67.1) |
| No financial strain | 1.73 (1.18-2.52) | 1.56 (1.04-2.36) | 2.24 (0.92-6.74) | 0.42 (0.09-3.05) |
| No osteoarthritis | 1.42 (1.01-1.99) | 1.51 (1.02-2.25) | 1.28 (0.66-2.61) | 2.57 (0.42-50.6) |
| Physical activity | 1.17 (1.00-1.37) | 1.34 (1.10-1.63) | 1.01 (0.74-1.36) | 1.53 (0.71-3.58) |
| Body mass index | 0.95 (0.93-0.97) | 0.96 (0.94-0.98) | 0.93 (0.87-0.98) | 0.90 (0.74-1.06) |
| No. of medications | 0.93 (0.88-0.99) | 0.95 (0.90-1.01) | 0.92 (0.77-1.06) | 0.98 (0.60-1.33) |
| Baseline PCS | 0.84 (0.83-0.86) | 0.91 (0.88-0.93) | 0.85 (0.72-1.00) | 0.46 (0.19-0.84) |
| No. with outcome (change of ≥5 points in PCS), No. (%) | 265 (15) | 209 (35) | 48 (8) | 8 (1) |
Abbreviation: PCS, physical component score.
a
Variables in the models were selected based on logistic regression adjusting for baseline PCS at visit 8. Age was forced into all models despite lack of statistical significance.