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Developing a quality of life instrument in patients with psoriasis: the Psoriasis Quality of Life Questionnaire (PQLQ)
Author(s) -
Inanır Işıl,
Aydemir Ömer,
Gündüz Kamer,
Esen Danacı Ayşen,
Türel Aylin
Publication year - 2006
Publication title -
international journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 93
eISSN - 1365-4632
pISSN - 0011-9059
DOI - 10.1111/j.1365-4632.2005.02448.x
Subject(s) - psoriasis , medicine , quality of life (healthcare) , psychosocial , construct validity , reliability (semiconductor) , convergent validity , physical therapy , validity , psychometrics , disease , internal consistency , clinical psychology , dermatology , psychiatry , nursing , power (physics) , physics , quantum mechanics
Background and design Psoriasis is a chronic skin disease which causes psychological, social and physical problems and affects quality of life. The aim of this study was to develop a quality of life instrument for patients with psoriasis which is suitable for Islamic populations. Materials and methods The psychosocial and daily life problems defined by 75 patients with psoriasis, their relatives and physicians were used to construct a questionnaire, the reliability and validity of which were determined in a group of 156 patients with psoriasis. Results For reliability, Chronbach's α coefficient was 0.87, and item‐total correlations were between 0.37 and 0.60 for internal consistency. There was high test‐retest reliability ( r = 0.98, P < 0.001). For validity, three factors were extracted in the principal components method for construct validity. The maximum factor loadings of each item were between 0.456 and 0.681. For convergent validity, all patients’ self‐ratings and Psoriasis Area and Severity Index (PASI) were correlated with the questionnaire score ( P < 0.001). Conclusion The questionnaire consisting of 17 items was found to be suitable for both epidemiologic and clinical trials.