Characteristics of persons with RA in the random sample drawn from claims data (n = 2535), stratified by number of comorbidities.
| Characteristics | No. Comorbidities | ||||
|---|---|---|---|---|---|
| 0–1, n = 604 (16.5%) | 2–4, n = 1060 (42.8%) | 5–7, n = 632 (29.6%) | ≥ 8, n = 239 (11.1%) | Total, n = 2535 (100%) | |
| Female sex | 80.0 | 82.3 | 80.6 | 73.6 | 80.4 |
| 18–49 yrs | 33.9 | 9.5 | 2.5 | 0.7 | 10.5 |
| 50–64 yrs | 49.0 | 39.0 | 24.9 | 11.4 | 33.4 |
| 65–79 yrs | 17.1 | 51.5 | 72.6 | 87.9 | 56.1 |
| Seropositive | 36.7 | 31.8 | 28.4 | 26.9 | 31.1 |
| Rheumatologic care | 86.6 | 78.3 | 78.9 | 76.7 | 79.7 |
| BMI ≥ 30 kg/m2 | 9.1 | 21.1 | 23.6 | 32.0 | 21.0 |
| Smoking, never | 56.6 | 66.9 | 64.3 | 68.5 | 64.6 |
| SJC (0–48), mean ± SEM | 5.1 ± 0.4 | 7.9 ± 0.5 | 8.9 ± 0.7 | 9.2 ± 1.0 | 7.8 ± 0.3 |
| TJC (0–50), mean ± SEM | 9.5 ± 0.6 | 12.6 ± 0.5 | 13.6 ± 0.7 | 15.7 ± 1.1 | 12.7 ± 0.3 |
| No. disorders, mean ± SEM | 0.6 ± 0.0 | 3 ± 0.0 | 5.9 ± 0.0 | 9.4 ± 0.1 | 4.2 ± 0.1 |
| ≥ 1 admission to hospital | 17.3 | 26.3 | 38.5 | 55.0 | 31.6 |
Values are in % unless otherwise indicated. RA: rheumatoid arthritis; BMI: body mass index, TJC: self-reported tender joint count; SJC: self-reported swollen joint count; SEM: standard error of the mean.