The Excoriation (skin-picking disorder) dimensional scale (SPD-D) is a new measure of excoriation skin picking disorder (SPD). The 5-item scale was developed by the Diagnostic and Statistical Manual (Fifth Edition) obsessive–compulsive spectrum disorders sub-workgroup to assist in the dimensional assessment of SPD.
The aim of the present study was to provide a psychometric evaluation of this new scale in a large community sample. 803 participants were recruited from online community noticeboards around Australia.
The results indicated that the SPD-D demonstrated a unidimensional structure, high internal consistency (r
s = .87, .86, and .92 across three samples), and good test–retest reliability (r
s = .86). The SPD-D also demonstrated good convergent validity with the Skin-Picking Scale Revised (r
s = .90) as well as divergent validity with the generalised anxiety disorder scale (r
s = .40).
Overall, the SPD-D appears to be a brief and reliable measure of SPD symptomatology.