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12-Item Pruritus Severity Scale: Development and Validation of New Itch Severity Questionnaire
Adam Reich1,2, Agnieszka Bożek1, Katarzyna Janiszewska1
1Department of Dermatology, Venereology and Allergology, Wroclaw Medical University, Wroclaw, Poland.
Introduction:
A validated assessment of pruritus intensity is an important but still difficult clinical problem due to a subjective nature of this sensation.
Objective:
The aim of this study was the creation and validation of new itch severity questionnaire assessing pruritus intensity.
Material And Methods:
A total of 148 patients with pruritic dermatoses were asked to assess pruritus intensity using 12-Item Pruritus Severity Score (12-PSS) and Visual Analogue Scale (VAS). Patients were also asked to complete the Dermatology Life Quality Index (DLQI) and Hospitality Anxiety and Depression Scale (HADS). Test-retest comparison of 12-PSS was conducted in 102 subjects who completed the itch questionnaire twice with the 3- to 5-day interval.
Results:
We have created the 12-PSS assessing pruritus intensity (two questions), pruritus extent (one question) and duration (one question), influence of pruritus on concentration and patient psyche (four questions), and scratching as a response to pruritus stimuli (four questions). A maximum scoring was 22 points. The results showed strong consistency (Cronbach α coefficient 0.81). A significant correlation was observed with VAS (r = 0.58, p < 0.001) and quality of life level according to DLQI (r = 0.53, p < 0.001). Test-retest comparison in 102 subjects revealed a satisfactory reproducibility of achieved results (ICC = 0,72).
Conclusions:
The newly developed pruritus severity questionnaire may be used in daily clinical practice in the future.
