The Spanish version of the Excoriation (Skin-Picking Disorder) Dimensional Scale (SPD-D): An assessment of its psychometric properties

Abstract

BackgroundIn 2013, the DSM‐5 obsessive-compulsive spectrum disorders sub‐workgroup developed the Excoriation (skin‐picking disorder) Dimensional Scale (SPD‐D) as a dimensional assessment that enquires about excoriation disorder symptoms that have occurred over the past week. This study aimed to assess the psychometric properties of the Spanish version of the SPD‐D in a population sample from Paraguay. MethodParticipants were recruited through an Internet-based survey. Subjects included were individuals ≥ 18 years old, who self-reported a diagnosis meeting the criteria for excoriation disorder. 531 individuals were rated for the validation analysis. SPD-D was back-translated and validated into Spanish. Exploratory and confirmatory factorial analysis were performed. Participants were also assessed with the Skin Picking Scale-Revised (SPS-R). ResultsExploratory factorial analysis reported that only one factor had a raw eigenvalue greater than 1, and explained 57.4% of total variance. Thus, the scale is considered one-dimensional, as confirmed by confirmatory analysis. Fit indices suggest a good adjustment and Cronbach’s alpha showed good internal consistency (α=0.816). Good convergence was found between the scores of the SPD-D and the SPS-R (r=0.822, p<0.0001). ConclusionThe Spanish version of SPD-D shows good psychometric properties and adequately reproduces the one-dimensional model of the original English version.