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Demographic characteristics of patients and controls
| Characteristics | Patients | Controls |
|---|---|---|
| Number | 97 | 91 |
| Men, n(%) | 41 (42) | 40 (44) |
| Women, n (%) | 56 (58) | 51 (56) |
| Age range (years) | 27–56 | 23–52 |
| Average age (SD) | 36 (7) | 34 (6) |
| Average duration of disease in years (SD) | 7.4 (6) | – |
Note: ‘–’ indicates not applicable.
