The MATRICS Consensus Cognitive Battery (MCCB) is the primary cognitive test battery recommended for clinical trials in schizophrenia populations. The MCCB has been successfully translated to multiple foreign languages and used in many international clinical trials, which has generated an interest to test whether language and regional differences have an influence on the psychometric characteristics of the MCCB.
The primary aim of the present study was to examine regional differences and the influence of language specific norming on test-retest stability and practice effects of the MCCB. We present results using both English speaking norms and language/region specific norms.

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