Table 3.
Unadjusted Associations of Predictors with the WBP and NWBP Trajectory Groups
| Factors | RR of WBP (95% CI)* | RR of NWBP (95% CI)* | ||
|---|---|---|---|---|
| Mild vs No | Moderate vs No | Mild vs No | Moderate vs No | |
| age | 0.986 (0.969-1.003) | 0.987 (0.967-1.007) | 0.994 (0.978-1.011) | 0.977 (0.956-0.999) |
| BMI | 1.064 (1.03-1.099) | 1.134 (1.092-1.178) | 1.06 (1.029-1.093) | 1.124 (1.082-1.168) |
| quadriceps | 0.999 (0.998-1) | 0.997 (0.995-0.998) | 0.998 (0.997-1) | 0.997 (0.996-0.999) |
| hamstrings | 0.998 (0.996-1) | 0.995 (0.992-0.998) | 0.996 (0.994,0.999) | 0.995 (0.992-0.998) |
| Sex (male) | 0.851 (0.633-1.144) | 0.811 (0.571-1.153) | 0.726 (0.544-0.969) | 0.658 (0.449,0.962) |
| With BML | 2.454 (1.729-3.482) | 5.636 (3.257-9.755) | 1.565 (1.091-2.244) | 2.431 (1.408-4.194) |
| depression | 1.592 (0.863-2.939) | 3.246 (1.739-6.059) | 2.204 (1.289-3.77) | 3.525 (1.948-6.38) |
| Multisite pain | 2.443 (1.806-3.304) | 3.679 (2.564-5.279) | 2.057 (1.547-2.733) | 3.39 (2.303-4.991) |
| With effusion | 1.477 (1.103-1.977) | 2.49 (1.742-3.561) | 1.697 (1.277-2.255) | 2.017 (1.383-2.942) |
| With ROA | 2.238 (1.655-3.027) | 8.495 (5.663-12.744) | 2.668 (1.999-3.56) | 6.541 (4.235-10.1) |
| College education | 1.061 (0.78-1.445) | 0.476 (0.335-0.677) | 0.766 (0.571-1.027) | 0.422 (0.291-0.611) |
| comorbidity | 1.389 (0.957-2.017) | 2.078 (1.376-3.138) | 1.229 (0.869-1.74) | 2.212 (1.474-3.319) |
Notes: Bold denotes statistically significant results. *RR (95% CI): relative risk (95% confidence interval) for belonging in each trajectory relative to reference trajectory (No pain).
Abbreviations: NWBP, Non-weight-bearing pain; WBP, Weight-bearing pain; BMI, Body mass index; ROA, Radiographic knee osteoarthritis; BML Bone marrow lesion.