Table 3.
Multivariable linear model of change in Knee Injury and Osteoarthritis Outcomes Score (KOOS) pain. Independent variables include change in hamstring strength between baseline and 3-months, baseline KOOS Pain, and musculoskeletal (MSK) index score categories excluding outliers (N = 111).
| Parameter | Estimate | 95% Confidence interval | P-Value |
|---|---|---|---|
| Intercept | −18.51 | −32.94 to (−)4.07 | 0.012 |
| ΔHamstring Strength0–3mo | 0.29 | −0.005 to 0.59 | 0.054 |
| Baseline KOOS Pain | 0.45 | 0.28 to 0.62 | <0.0001 |
| MSK Index | |||
| 0a | 18.03 | 5.86 to 30.20 | 0.004 |
| 0.01–1a | 11.33 | −0.41 to 23.07 | 0.059 |
| >1a | Reference | Reference | Reference |
a
The MSK index ordinal variable was derived from the average values reported by each participant across 6 body regions assessed by the MSK functional limitation scale. Possible responses for each body region indicated that region's degree of limitation as “a lot” (2 points), “a little” (1), or “not at all” (0).