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The Skin Picking Impact Scale (SPIS): scale development and psychometric analyses.
N J Keuthen1, T Deckersbach, S Wilhelm
1Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Charlestown 02129-2060, USA. keuthen@psych.mgh.harvard.edu
Psychosomatics
|December 12, 2001
Summary
The Skin Picking Impact Scale (SPIS) effectively measures psychosocial distress from skin picking behaviors. A 10-item version shows good reliability and distinguishes between self-injurious and non-self-injurious skin picking.
Area of Science:
- Psychiatry
- Psychology
- Dermatology
Background:
- Repetitive skin picking is a significant behavior with psychosocial consequences.
- Existing measures may not fully capture the impact of skin picking behaviors.
Purpose of the Study:
- To develop and validate the Skin Picking Impact Scale (SPIS) for assessing psychosocial consequences.
- To differentiate between self-injurious and non-self-injurious skin picking.
Main Methods:
- Development of a 28-item scale, followed by item reduction based on difficulty and correlations.
- Administration to 31 individuals with self-injurious skin picking and 78 with non-self-injurious skin picking.
- Psychometric analyses including internal consistency, correlations, and receiver operating characteristic (ROC) analysis for cutoff determination.
Main Results:
- A 10-item SPIS demonstrated good internal consistency.
- SPIS scores were significantly higher in individuals with self-injurious skin picking.
- SPIS scores correlated with picking duration, satisfaction, shame, depression, and anxiety.
- A cutoff score of 7 optimally discriminated between self-injurious and non-self-injurious skin picking.
Conclusions:
- The 10-item SPIS is a reliable and valid instrument for assessing the psychosocial impact of skin picking.
- The SPIS can effectively distinguish individuals with self-injurious skin picking.
- The scale aids in understanding the distress associated with skin picking behaviors.