Cross-cultural adaptation, validity and reliability of the Turkish version of the Cognitive Functioning Self-Assessment Scale (CFSS)

The Cognitive Functioning Self-Assessment Scale (CFSS) is a scale that enables individuals to assess their subjective cognitive performance. The study aimed to cross-culturally adapt the CFSS to Turkish (CFSS-TR) and prove its psychometric properties. The study included 180 community-dwelling adults over 18 years of age with no psychological or neurological disorders. Participants were assessed using the CFSS-TR, Hospital Anxiety Depression Scale (HADS), and the Cognitive Failures Questionnaire (CFQ) via online survey. Two weeks later, the CFSS-TR was taken from the participants for the second time. The mean age of the individuals was 41.06 ± 13.34 years. The CFSS-TR had good test-retest reliability (ICC: 0.84, CI 95%: 0.78-0.88) and good internal consistency (α = 0.88). The standard error of measurement (SEM) and the 95% confidence interval minimal detectable change (MDC95) values for the total score were 0.11 and 0.30, respectively. CFSS-TR had a strong correlation with CFQ, moderate correlation with HADS depression subscore, and weak correlation with HADS anxiety subscore (respectively r = 0.71, r = 0.52, r = 0.39, p < 0.001). CFSS-TR is a reliable and valid questionnaire for self-assessment of cognitive function in Turkish-speaking community-dwelling adults.