Test–retest reliability and convergent validity of the test of nonverbal intelligence-fourth edition in patients with schizophrenia

Abstract Background Fluid intelligence deficits affect executive functioning and social behaviors in patients with schizophrenia. To help clinicians manage fluid deficits, a psychometrically sound measure is needed. The purposes of this study were to examine the test–retest reliability convergent validity Test Nonverbal Intelligence-Fourth Edition (TONI-4) assessing Methods A total 103 stable condition assessed TONI-4 twice 4-week interval reliability. We further used Montreal Cognitive Assessment (MoCA) Tablet-Based Symbol Digit Modalities (T-SDMT) TONI-4. Results intra-class correlation coefficient was 0.73 for percentages standard error measurement minimal detectable change 5.1 14.2%, respectively. practice effect small (Cohen’s d = ? 0.03). Convergent showed moderate significant correlations between MoCA as well T-SDMT ( r 0.35, p .011 0.61, < .001 MoCA). results demonstrated that had good reliability, limited random error, trivial effect. good. Conclusions These findings indicate has potential be reliable valid assessment