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P-values of Fisher's exact tests or chi-square tests of homogeneity of proportions across the three sample groups, and pairwise comparisons of positive predictive values of definite, probable, and clinical RA excluding those who reported prednisone only or other rheumatic conditions.
| Comparison | Definite RA | Probable RA | Clinical RA |
|---|---|---|---|
| Homogeneity | 0.03 | 0.02 | 0.0005 |
| DMARDs vs. No Meds | 0.02 | 0.02 | 0.0004 |
| DMARDs vs. NSAIDs | 0.08* | 0.10* | 0.02 |
| NSAIDs vs. No Meds | 0.43 | 0.25 | 0.16 |
Chi-square test
