Developing a quality of life questionnaire in patients with psoriasis; [Psoriasisli hastalarda yaşam kalite ölçeǧi geliştirilmesi]
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Date
2003
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Abstract
Background and design: Psoriasis is a chronic skin disease which causes psychological, social and physical problems and affecting quality of life. Developing a quality of life instrument for patients with psoriasis which is suitable for our country is aimed in this study. Materials and methods: Twenty five patients with psoriasis, 25 relatives and 25 doctors were questionned about daily life problems caused by psoriasis and the mostly defined problems were collected in an questionnaire. The reliability and validity of this questionnaire were analysed in a group of 156 patients. Results: For reliability, Chronbach's α coefficient was 0.87, and item-total correlations were between 0,37-0,60 in internal consistency. There was a high test-retest reliability (r=0.98, p<0.001). For validity, three factors were extracted in the Principal Components Method in construct validity. The maximum factor loadings of each item were between 0.456-0.681. In convergent validity, all patients' self-ratings and PASI were correlated with the questionnaire score (p<0.001). Conclusion: The questionnaire consisting of 17 items were found to be suitable for both epidemiologic and clinical trials.