Validating the Adult Concentration Inventory for Measuring Cognitive Disengagement Syndrome in an Iranian Population: Insights Into Mental Health and Cognitive Functioning

Background Recently, research on cognitive disengagement syndrome (CDS)—previously known as sluggish cognitive tempo—has expanded considerably. The Adult Concentration Inventory (ACI) is designed to assess CDS, and its psychometric soundness, including validity and reliability, needs to be evaluated across diverse countries and populations. Methods This study assesses the questionnaire's psychometric properties in Iran. The study included 2855 people, 69% of whom were female and had a mean age of 27.42. The ACI questionnaire, Patient Health Questionnaire‐9 (PHQ‐9), and Executive Skills Questionnaire‐Revised (ESQ‐R) were completed in this study. Results We found that the three‐factor model (attention problems, sluggishness, and mind‐wandering) matches the questionnaire using exploratory and confirmatory analysis. Based on the fit indices, the original correlated three‐factor model of the ACI was considered adequate: χ 2 = 815.20; df = 101; RMSEA = 0.050; CFI = 0.95; TLI = 0.94; IFI = 0.95; SRMR = 0.03. Conclusions The results of this study demonstrated that CDS in Iranian society may be measured using the ACI questionnaire.