Psychometric Evaluation of an Adapted Short-Form Spirituality Scale in a Sample of Predominantly White Adults in an Inpatient Substance Use Disorder Treatment Program

Spirituality is an important aspect of treatment and recovery for substance use disorders (SUDs), but ambiguities in measurement can make it difficult to incorporate as part of routine care. We evaluated the psychometric properties of an adapted short-form version of the Spirituality Scale (the Spirituality Scale-Short-Form; SS-SF) for use in SUD treatment settings. Participants were adult patients (N = 1,388; M_age = 41.23 years, SD_age = 11.55; 68% male; 86% White) who entered a large, clinically mixed inpatient SUD treatment program. Factor analysis supported the two-dimensional structure, with factors representing Self-Discovery and Transcendent Connection. Tests of measurement invariance demonstrated that the scale was invariant across age and gender subgroups. The SS-SF exhibited convergent and concurrent validity via associations with participation in spiritual activities, hopefulness, life satisfaction, 12-step participation, and depressive symptoms. Finally, scores on the SS-SF were significantly higher at discharge compared to admission, demonstrating short-term sensitivity to change. These findings support use of the SS-SF as a concise, psychometrically sound measure of spirituality in the context of substance use treatment.