Validation of a treatment satisfaction questionnaire in patients with moderate to severe psoriasis.: Neoderma study

An observational, prospective, multicenter study, with 423 moderate to severe psoriasis patients, was conducted to validate a new Psoriasis Treatment Satisfaction Questionnaire. Feasibility: 98.9% of patients completed the whole questionnaire. Factor analysis revealed a unique dimension that explained 54.6% of total variance (cross-sectional validity). The questionnaire score presented low-moderate correlations with PASI index along the study (r=0.15 to 0.38) and high correlations with patient's global assessment of treatment satisfaction (r=-0.75 to -0.81) (longitudinal validity). Good internal reliability (global Cronbach's alpha of 0.92) and reproducibility (intraclass correlation coefficient of 0.89) were also demonstrated. The new questionnaire for the assessment of treatment satisfaction in psoriasis is a useful, feasible and reliable tool.