Development and Validation of a Novel Questionnaire for Adherence with Topical Treatments in Psoriasis (QATOP).

Background: Self-report measures are the most used methodologies for the evaluation of adherence to psoriasis topical treatment, although currently there is no standard questionnaire for this purpose.

Objective: The present study aimed at developing a novel questionnaire (Questionnaire for Adherence to TOPical treatment [QATOP]) for the assessment of adherence to topical treatment in psoriasis.

Methods: A questionnaire containing nine items organized into two parts (part 1: current patient treatment; part 2: adherence to treatment, amount used, and treatment-associated variables) was developed, supported by a systematic literature review, qualitative patient focus interviews, and expert-group input.