Table 1.
Comparison of demographic data of patients with connective tissue diseases and healthy controls.
| Variable | SLE ( N = 54) | DM ( N = 32) | SSc ( N = 51) | Controls ( N = 108) |
|---|---|---|---|---|
| Mean age (year ± SD) | 34.9 ± 15.5 | 52.2 ± 16.9 | 56.8 ± 12.5 | 35.2 ± 10.4 |
| Sex | ||||
| • Male | 6 (11.1%) | 8 (25%) | 9 (17%) | 41 (37.9%) |
| • Female | 48 (88.9%) | 24 (75%) | 42 (83%) | 67 (62.1%) |
| • F/M ratio | 8:1 | 3:1 | 4.6:1 | 1.6:1 |
| Mean disease duration (year ± SD) | 7.6 ± 8.9 | 3.8 ± 4.5 | 7.2 ± 6.0 | – |
| Fitzpatrick skin type | III–V | III–V | III–V | III–V |
| Southeast asian descent | 54 (100%) | 32 (100%) | 51 (100%) | 108 (100%) |
DM, dermatomyositis; F, female; M, male; SD, standard deviation; SLE, systemic lupus erythematosus; SSc, systemic sclerosis.