Eva Mazzotti, Claudio Barbaranelli, Angelo Picardi, Damiano Abeni, Paolo Pasquini
DOI: 10.1080/00015550510032832

The Dermatology Life Quality Index (DLQI) is one of the most frequently used questionnaires to evaluate the impact of dermatological diseases on patients' lives. This study aimed to assess the reliability and validity of the instrument and to test its unidimensionality in a large sample of patients with psoriasis (n =976) hospitalized at IDI-IRCCS, Rome, Italy. Nine hundred patients completed the DLQI, the Psoriasis Disability Index (PDI) and the Skindex-29 (response rate 92%). The internal consistency of the DLQI was high (Cronbach's alpha=0.83). Evidence of convergent validity was provided by high (r=0.64