Background. Semi-quantitative nailfold capillaroscopy (NFC) scoring represents a promising tool for assessing disease activity, severity and change in systemic sclerosis (SSc), however there is no consensus yet over which capillaroscopy abnormalities should be analyzed and how. Objective. Investigation of the reliability of the qualitative and semi-quantitative scoring of NFC assessment between two raters and test-retest for each rater in a SSc cohort. Methods. This is a single-center pilot study where 2 raters assessed the NFC images of 48 consecutive patients with SSc. Data were analyzed in 3 ways: 1. qualitatively by “normal”/“abnormal” category; 2. qualitatively by the following categories: “early”, “active”, “late” SSc patterns, “normal”, and unclassifiable in any pattern, and step; 3. Semi-quantitatively by calculating the mean score for capillary loss, disorganization of the microvascular array, giant capillaries, microhaemorrhages and capillary ramifications and combinations of giant capillaries and microhaemorrhages (as a surrogate for vascular activity). Disorganization and ramifications (surrogate for vascular damage) were also assessed. Variables for all steps were cal
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