Objective: The Dermatology Life Quality Index (DLQI) is a widely used quality of life scale in many dermatological diseases such as psoriasis. Recently, there have been discussions about the inadequacy of DLQI in the evaluation of dermatological diseases. This study aimed to examine the psychometric properties of the DLQI scale, in a sample of Turkish psoriatic patients. Material and Methods: A total of 979 psoriasis patients, 509 male (52.4%) and 470 female (47.6%), who filled out the DLQI questionnaire between April 2013 and January 2019, were included in the study. This was a retrospective study conducted. Data were analyzed using the Rasch model to obtain meaningful scores for the DLQI. Results: According to the Rasch analysis, the measurement ability of the ninth question was found to be insufficient in general. It has been determined that DLQI scale items can vary in measuring ability according to age, gender and marital status are insufficient. In addition, it was found that the assumption that the answers in Likert-type expressions in the DLQI scale are equidistant from each other is not correct. Conclusion: DLQI seems to have a poor fit with the Rasch model for Turkish psoriasis patients. In addition, DLQI may vary according to age, gender and marital status. Therefore, it is recommended to develop new scales in the evaluation of psoriasis patients.
Keywords: Psoriasis; Dermatology Life Quality Index; Rasch analysis
Amaç: Dermatoloji Yaşam Kalitesi İndeksi [Dermatology Life Quality Index (DLQI)], psöriyazis hastalığı gibi birçok dermatolojik hastalıkta yaygın olarak kullanılan bir yaşam kalitesi ölçeğidir. Son zamanlarda DLQI'nın dermatolojik hastalıkların değerlendirmesindeki yetersizliği tartışılmaktadır. Bu çalışmada, DLQI ölçeğinin psikometrik özelliklerinin Türk psöriyatik hasta örneğinde incelenmesi amaçlamıştır. Gereç ve Yöntemler: Nisan 2013-Ocak 2019 tarihleri arasında DLQI anketini dolduran 509 (%52,4) erkek ve 470 (%47,6) kadın olmak üzere toplam 979 psöriyazis hastası çalışmaya dâhil edilmiştir. Bu retrospektif olarak yapılmış bir çalışmadır. Veriler, DLQI için anlamlı puanlar elde etmek üzere Rasch modeli kullanılarak analiz edilmiştir. Bulgular: Rasch analizine göre dokuzuncu sorunun ölçme yeteneği genel olarak yetersiz bulunmuştur. DLQI ölçek maddelerinin yeteneği ölçmede yaşa, cinsiyete ve medeni duruma göre farklılık gösterebildiği ve yetersiz olduğu belirlenmiştir. Ayrıca DLQI ölçeğindeki Likert tipi ifadelerdeki cevapların birbirine eşit uzaklıkta olduğu varsayımının doğru olmadığı görülmüştür. Sonuç: DLQI, Türk psöriyazis hastaları için Rasch modeli ile zayıf bir uyum göstermiştir. Ayrıca DLQI yaşa, cinsiyete ve medeni duruma göre değişkenlik gösterebilir. Bu nedenle psöriyazis hastalarının değerlendirilmesinde yeni ölçeklerin geliştirilmesi önerilmektedir.
Anahtar Kelimeler: Psöriyazis; Dermatoloji Yaşam Kalitesi İndeksi; Rasch analizi
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