Multivariable logistic regression models
| Model based on factors | Model based on factors without shoulder tenderness plus presence of RF/ACPA | Model based on factors plus presence of RF/ACPA and MHAQ | ||||
|---|---|---|---|---|---|---|
| Criterion | Odds ratio (95% CI) | p Value | Odds ratio (95% CI) | p Value | Odds ratio (95% CI) | p Value |
| Hip pain or limited hip range of motion | 2.7 (1.5 to 4.8) | 0.001 | 2.1 (1.1 to 4.0) | 0.019 | 1.6 (0.8 to 3.2) | 0.16 |
| Other joint pain | 0.4 (0.2 to 0.6) | <0.001 | 0.4 (0.2 to 0.7) | 0.002 | 0.3 (0.1 to 0.6) | <0.001 |
| Morning stiffness >45 min duration | 5.2 (2.9 to 9.4) | <0.001 | 6.2 (3.2 to 11.8) | <0.001 | 4.8 (2.4 to 9.6) | <0.001 |
| Shoulder tenderness | 0.9 (0.5 to 1.8) | 0.80 | ||||
| Presence of RF or ACPA | 0.3 (0.1 to 0.8) | 0.009 | 0.3 (0.1 to 0.8) | 0.013 | ||
| MHAQ, per 1 unit increase | 2.4 (1.4 to 4.2) | 0.002 | ||||
| Likelihood ratio test for additional terms | p<0.001 | p<0.001 | ||||
| c-Statistic | 79% | 81% | 81% | |||
ACPA, anticitrullinated protein antibody; MHAQ, modified health assessment questionnaire; RF, rheumatoid factor.