Table 2.
Linear Regression Model Results: KOOS Pain a
| Variable | Estimate (95% CI) b | P |
|---|---|---|
| Age | –0.41 (–0.5 to –0.32) | <.001 |
| Sex, female (vs male) | –2.56 (–4.27 to –0.84) | .004 |
| Race | ||
| Black (vs White) | 0.7 (–2.47 to 3.86) | .666 |
| Other (vs White) | 0.48 (–3.77 to 4.74) | .823 |
| BMI | –0.54 (–0.69 to –0.39) | <.001 |
| Years of education | 0.56 (0.27 to 0.84) | <.001 |
| Smoking status | ||
| Quit (vs never) | –0.69 (–3.35 to 1.97) | .611 |
| Current (vs never) | –7.92 (–11.15 to –4.7) | <.001 |
| Baseline VR-12 MCS | 0.37 (0.29 to 0.46) | <.001 |
| Insurance, Medicaid (vs commercial) | –6.13 (–9.87 to –2.38) | .001 |
| Tear location | ||
| Medial (vs no tear) | –0.19 (–2.55 to 2.17) | .873 |
| Lateral (vs no tear) | 1.48 (–0.7 to 3.67) | .183 |
| Both (vs no tear) | –0.47 (–3.19 to 2.25) | .733 |
| Race × insurance | ||
| Black × Medicaid | 2.17 (–3.69 to 8.03) | .468 |
| Other × Medicaid | 1.1 (–9.72 to 11.91) | .843 |
a Boldface P values indicate a statistically significant difference between groups compared (P < .05). BMI, body mass index; KOOS, Knee injury and Osteoarthritis Outcome Score; VR-12 MCS, Veterans RAND 12-Item Health Survey Mental Component Score.
b This value represents the estimated change in KOOS Pain. As an example, the estimated change in KOOS Pain per 1-year increase in patient age was –0.41 points. The estimated difference in KOOS Pain among female versus male patients was –2.56 points.