Importance: Empirical evidence is needed on the psychometric properties of the Allen Cognitive Level Screen–Sixth Edition (ACLS–6), an instrument that assesses cognitive functions and is commonly used for people living with schizophrenia.
Objective: To examine the convergent validity, discriminative validity, and test–retest reliability of two tasks, stitching and copying, in the ACLS–6 for community-dwelling people living with schizophrenia.
Design: Prospective observational study.
Setting: Psychiatric center.
Participants: 110 people living with schizophrenia.
Outcomes and Measures: To examine convergent validity, we calculated correlations (Pearson’s r) between the two tasks and between these two tasks and three cognitive measures. We checked for floor and ceiling effects and conducted independent t tests to evaluate discriminative validity. We calculated intraclass correlation coefficients (ICCs) to investigate test–retest reliability.
Results: We found a strong correlation (r = .88) between the two tasks and moderate correlations (rs = .32–.52) between the two tasks and the three cognitive measures. No floor or ceiling effects were observed for the two tasks, and t tests showed significant differences between two participant groups with marginal and mild clinical symptoms (p < .001). The ICC values for the two tasks were .71–.74.
Conclusion and Relevance: The stitching and copying tasks of the ACLS–6 have good convergent validity, discriminative validity, and test–retest reliability for community-dwelling people living with schizophrenia. The copying task showed a strong correlation with the stitching task and a similar score range, so practitioners can consider using the copying task as a substitute for the stitching task.
What This Article Adds: The stitching and copying tasks of the ACLS–6 have sound psychometric properties for measuring cognitive functions in community-dwelling people living with schizophrenia.