Fig. 1From: Health-related quality of life in porphyria cutanea tarda: a cross-sectional registry based studyNorm-based scores (T-scores) with 95% confidence intervals for PCS, MCS and SF-12 subdomains in the total sample, and for men and women separately compared with the US 2009 norm. Group-level scores between 47 and 53 are within the normal range. The norm based t-scores have a mean of 50 and a standard deviation of 10 [14]Back to article page