Table 1.
Baseline characteristics: all participants
| All (n=40 136) | |
|---|---|
| Age (years) | 44 (34–51) |
| Gender (female) | 58% |
| BMI (kg/m2) | 25 (23–28) |
| Obesity | 15% |
| Smoking (pack years) | 0 (0–8) |
| Smoking status | |
| Never smoker | 49% |
| Former smoker | 30% |
| Current smoker | 21% |
| Alcohol intake (g/day) | 3 (0–11) |
| Fish intake (servings/month) | 5 (2–9) |
| Sugar-sweetened soft drink intake (glasses/month) | 6 (0–22) |
| Periodontitis (self-reported) | 12% |
| Joint complaints: pain and/or stiffness in hands and/or feet | 21% |
| Joint complaints: both pain and stiffness in hands and/or feet | 12% |
| FDR with rheumatism | 14% |
| Self-reported RA | 2.1% |
| Defined RA | 0.3% |
| In women (n=23 256) | |
| Nulliparity | 27% |
| Menopausal status, categories | |
| Premenopausal | 63% |
| Postmenopausal and hormone use | 4% |
| Postmenopausal and no hormone use | 33% |
| Regular menses | 77% |
| Age of menarche ≤10 | 2% |
Data are presented as median (IQR) for continuous variables and percentages for categorical variables.
BMI, body mass index; FDR, first-degree relative; RA, rheumatoid arthritis.