Table 3.
Baseline sociodemographic characteristics of participants, SCREEN-RA cohort, Switzerland, 2009–2020
| Variable | No (%) (total n=1458) | |
| Age group, years | 18–25 | 172 (12) |
| 25–50 | 779 (53) | |
| 50–75 | 494 (34) | |
| >75 | 13 (1) | |
| Year of education | 0–5 | 55 (4) |
| 5–10 | 83 (6) | |
| >10 | 785 (54) | |
| Not specified | 535 (37) | |
| Gender | Female | 1086 (74) |
| Ethnicity | White | 1322 (91) |
| Number of RA cases in participants’ family | 1 | 1158 (79) |
| 2 | 165 (11) | |
| >3 | 51 (4) | |
| Not specified | 84 (6) | |
| Tobacco smoking | Never | 727 (50) |
| Previous | 380 (26) | |
| Current | 283 (19) | |
| Not specified | 67 (5) | |
RA, Rheumatoid Arthritis; SCREEN-RA, Evaluation of a SCREENing strategy for Rheumatoid Arthritis.