VALIDATION DATA

1. RELIABILITY
A. Internal Consistency	Not Tested
Cronbach's (Describe)
B. Reliability intraobserver or test-retest	Tested
Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe)	The Spearman’s rank correlation coefficient was ranging from 0.79 (for IDS) to 0.95 (for IVS)
C. Reliability interobserver or Measurement error	Not Tested
Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe)

2. VALIDITY
A. Content validity: face validity	Tested
Expert opinion (relevance and comprehensiveness) (Describe)	physicians expert in the field of scleroderma
B. Construct Validity: Structural validity	Not Tested
Hypotheses-testing	Not Tested
Cross-cultural validity	Not Tested
Brief Description
C. Criterion validity	Tested
Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe)	Using Kruskal-Wallis test the Authors showed that the mean score for IVS was significantly higher in patients with finger-tip ulcers (p<0.01) or finger-tip osteolysis (p<0.05) than in patients without, and IVS was also higher in patients who had more severe capillary damage (p=0.03). Mean score for IRS was significantly higher in patients with pulmonary fibrosis (p<0.001), also in patients with reduced FVC (p<0.001), DLCO (p<0.001) and DLCO/VA (p<0.001). Patients with esophageal hypomotility had a higher mean score for IGS (p<0.001) than patients with normal esophageal motility. The mean score for IMSS showed a correlation with the skin score (p<0.001) and was significantly higher in patients with reduced hand motility (p<0.001), joint contractures (p<0.001), muscle weakness (p<0.001) or arthralgia/arthritis (p<0.001). The mean score for IDS was significantly higher in patients who had multisystemic involvement (p<0.001).