title: The Skin Picking Impact Scale: Factor structure, validity and development of a short version.
abstract: 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.
authors.affiliation: Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA. ivarsnorrason@gmail.com
authors.forename: Ivar
authors.initials: I
authors.lastname: Snorrason
authors.forename: Ragnar P
authors.initials: RP
authors.lastname: Olafsson
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Flessner
authors.forename: Nancy J
authors.initials: NJ
authors.lastname: Keuthen
authors.forename: Martin E
authors.initials: ME
authors.lastname: Franklin
authors.forename: Douglas W
authors.initials: DW
authors.lastname: Woods
mesh_terms: D000328:Adult; D007174:Disruptive, Impulse Control, and Conduct Disorders / Q000175:diagnosis* / Q000523:psychology; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D011594:Psychometrics; D057566:Self Report; D011795:Surveys and Questionnaires
keywords: Skin picking impact scale; factor analysis; pathological skin picking; psychogenic excoriation; psychosocial impact; reliability; validity