1980 Criteria for the Classification of Systemic Sclerosis
The American College of Rheumatology (former American Rheumatism Association – ARA) has defined criteria, that are 97 % sensitive and 98 % specific for systemic sclerosis (SSc) as follows:
Major criterion:
- Proximal diffuse (truncal) sclerosis (skin tightness, thickening, non-pitting induration)
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