Comparison of demographic, clinical, and serological data for the present series with similar data from other European series
| Present series | Vayssairat, et al,21Clin Rheumatol, 1992 | Jacobsen, et al,22 Br J Rheumatol, 1998 | Nagy and Czirjak,23Clin Rheumatol, 1997 | |
| Number of patients | 290 | 164 | 230 | 171 |
| Women (%) | 84 | 86 | 82 | 87 |
| Limited/diffuse SSc | 1.5 | 10 | 2.8 | 3.75 |
| Mean age at onset | 53 | 38 | 44 | — |
| Raynaud's phenomenon (%) | 92 | 100 | 96 | 95.3 |
| Digital pitting (%) | 62 | 71 | — | — |
| Telangiectasia (%) | 67 | 75 | 73 | 64.3 |
| Calcinosis (%) | 26 | 60 | 42 | 11.1 |
| Joint involvement (%) | 66 | 53 | 18 | — |
| Scleroderma renal crisis (%) | 0 | — | — | 1.2 |