Epidemiological risk factors for TB in TB cases with biologic-naïve RA and matched RA controls.
| Risk Factor | Cases, n = 31 | Controls, n = 122 | aOR* (95% CI) |
|---|---|---|---|
| Born before 1950 | 27 (87.1) | 106 (86.8) | – |
| History of TB | 6 (19.3) | 3 (2.4)a | 9.2 (2.1–39.4) |
| Family history of TB | 8 (25.8) | 4 (3.3)b | 10.6 (2.9–39.3) |
| Work-related risk | 3 (9.6)c | 10 (8.2)d | 0.9 (0.2–3.8) |
| Born in high-incidence countrye | 1 (3.2) | 0 (0) | NA |
| Born outside Nordic countriesf | 4 (12.9) | 3 (2.4) | 5.7 (1.2–27.1) |
| Lived/worked > 3 months in high-incidence countrye | 1 (3.2) | 0 (0) | NA |
↵a Missing data from 119 patients.
↵b Missing data from 118 patients.
↵c Missing data from 9 patients.
↵d Missing data from 29 patients.
↵e 100 cases/100,000.
↵f Includes high-incidence countries.
↵*> Estimated from logistic regression models adjusted for sex and age.
Values are expressed as n (%) unless stated otherwise.
aOR: adjusted OR; NA: not applicable; RA: rheumatoid arthritis; TB: tuberculosis.