Validation of the cognitively normal range and below normal range subtypes in chronically hospitalized patients with schizophrenia.

Background: Many studies have found a substantial minority of patients whose performance puts them within the normal range of neuropsychological functioning. Recently, a study has seen the delineation of two neurocognitive subtypes of schizophrenia -'cognitively normal range' (CNR) and 'below normal range' (BNR) - based on neurocognitive performance across multiple domains.

Methods: The participants were from two studies that collected neurocognitive, psychopathology and social function data between 2008 and 2015.