Logistic regression analysis for active disease status as a function of PAS-II, diagnostic group, and the interaction term (-2log-likelihood 1123, model chi-square fit 50.7 with 3 degrees of freedom, p < 0.001).
| p | OR (95% CI) | |
|---|---|---|
| PAS-II | 0.002 | 1.19 (1.07 to 1.33) |
| Diagnostic group* | 0.090 | |
| Other IA | 0.099 | 0.57 (0.29 to 1.11) |
| Noninflammatory | 0.033 | 0.26 (0.07 to 0.90) |
| Connective tissue disorders | 0.280 | 0.64 (0.28 to 1.45) |
| Other | 0.723 | 1.15 (0.54 to 2.45) |
| Diagnostic group × PAS-II | 0.120 | |
| Other IA by PAS-II | 0.098 | 1.16 (0.97 to 1.37) |
| Noninflammatory by PAS-II | 0.169 | 1.20 (0.93 to 1.56) |
| Connective tissue disorders by PAS-II | 0.827 | 1.02 (0.83 to 1.27) |
| Other by PAS-II | 0.217 | 0.91 (0.76 to 1.10) |
| Constant | 0.339 | 0.77 |
↵* Reference category is “rheumatoid arthritis”. PAS: Patient Activity Scale; IA: inflammatory arthritis.