Main descriptive data of 80 cases of systemic sclerosis and 160 matched controls
| Exposure | Cases | % | Controls | % |
|---|---|---|---|---|
| Sex | ||||
| Male | 11 | 13.8 | 22 | 13.8 |
| Female | 69 | 86.2 | 138 | 86.2 |
| Age (years) | ||||
| Mean (SD) | 55.8 (15.3) | 56.4 (15.6) | ||
| Smoking habits | ||||
| Non-smokers | 63 | 78.7 | 126 | 78.7 |
| Smokers | 17 | 21.3 | 34 | 21.3 |
| Age at disease onset (years) | ||||
| Mean (SD) | 47.8 (15.1) | – | – | |
| Cutaneous extension | ||||
| Limited scleroderma | 54 | 67.5 | – | – |
| Diffuse scleroderma | 26 | 32.5 | – | – |