BACKGROUND Measuring the quality of life measure of patients with dermatologic diseases
is an important concern. The instruments to evaluate it are commonly
originally written in English and need to be translated and validated to be
used in different cultures. OBJECTIVE The purpose of this paper is to translate and validate the Skindex-29
questionnaire to Brazilian Portuguese to be used in our country as a quality
of life assessment instrument in dermatologic patients. METHODS The first step was the translation from English to Brazilian Portuguese and
the back-translation by two native speakers. The translated version was then
used for the second step, when three questionnaires were applied to 75
patients (43 of whom were classified as lightly affected and 32 as heavily
affected by their dermatologic conditions): an identification questionnaire,
the translated version of Skindex-29, and the Brazilian Portuguese version
of Dermatologic Life Quality Index (DLQI). Additionally, the generic
questionnaire Short Form 36 (SF-36) was applied to 41 of these patients. The
last step to evaluate reproducibility was repeating the Skindex-29
questionnaire by the same researcher one week later in 44 patients. RESULTS Reliability was observed in global Skindex-29 scale (α=0.934), and its
domains emotions (α=0.926), symptoms (α=0,702), and psycosocial functioning
(α=0.860). The reproducibility showed high intraclass correlations. High
intra class correlations was observed, thus validating reliability. CONCLUSIONS The Skindex-29 quality of life questionnaire was properly translated and
validated to Brazilian Portuguese.
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