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The Skin Picking Impact Scale: Factor structure, validity and development of a short version
Author(s) -
Snorrason Ivar,
Olafsson Ragnar P.,
Flessner Christopher A.,
Keuthen Nancy J.,
Franklin Martin E.,
Woods Douglas W.
Publication year - 2013
Publication title -
scandinavian journal of psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 72
eISSN - 1467-9450
pISSN - 0036-5564
DOI - 10.1111/sjop.12057
Subject(s) - psychology , discriminant validity , internal consistency , psychosocial , confirmatory factor analysis , scale (ratio) , convergent validity , exploratory factor analysis , clinical psychology , psychometrics , concurrent validity , structural equation modeling , statistics , psychiatry , mathematics , physics , quantum mechanics
In the present study, we examined the psychometric properties of the Skin Picking Impact Scale ( SPIS ; Keuthen, Deckersbach, Wilhelm et al ., 2001), a 10 item self‐report questionnaire designed to assess the psychosocial impact of skin picking disorder ( SPD ). Participants were 650 individuals who met criteria for SPD in an online survey. Exploratory and confirmatory factor analyses demonstrated a unitary factor structure with high internal consistency ( α = 0.94). Consequently, we constructed an abbreviated 4‐item version that retained good internal consistency ( α = 0.87) and a robust factor structure. Both the short and the full versions demonstrated discriminant and convergent/concurrent validity. In conclusion, the findings indicate that both versions are psychometrically sound measures of SPD related psychosocial impact; however, some potential limitations of the full scale are discussed.