Characteristics of the study population (aged 45 yrs or older) by disease exposure status and observed outcomes.
| Cohort | Subjects, n | Age, Yrs, Mean (SD) | Women, % | Observed Outcome Hip Fracture | |
| Fractures, n | Person Time, Yrs | ||||
| Population | 74,598 | 57.7 (13.1) | 52 | 33,348 | 7,389,103 |
| RA | 8467 | 61.0 (10.9) | 70 | 549 | 56,791 |
| Hip OA | 29,706 | 63.4 (10.9) | 58 | 1119 | 179,292 |
| Knee OA | 55,753 | 60.5 (11.3) | 59 | 2365 | 324,253 |
| Cohort | Subjects, n | Age, Yrs, Mean (SD) | Women, % | Observed Outcome Radius Fracture | |
| Fractures, n | Person Time, Yrs | ||||
| Population | 741,598 | 57.7 (13.1) | 52 | 27,764 | 7,346,597 |
| RA | 8517 | 61.2 (11.0) | 70 | 294 | 57,453 |
| Hip OA | 29,767 | 63.5 (10.7) | 57 | 1046 | 178,823 |
| Knee OA | 55,103 | 60.6 (11.4) | 59 | 1785 | 321,295 |
RA: rheumatoid arthritis; OA: osteoarthritis.