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Design and validation of a brief scale for cognitive evaluation in people with a diagnosis of schizophrenia (BCog-S).

INTRODUCTION
Nurses play a key role in cognitive rehabilitation programs for people diagnosed with schizophrenia.


AIM
To design and validate a brief battery to assess the cognitive status of people diagnosed with schizophrenia from the nursing perspective.


METHOD
Study developed to evaluate a diagnostic test. The Brief Cognitive Scale for schizophrenia (BCog-S) is a hybrid battery composed of previously validated brief tests, designed to meet the dimensions of cognition considered by the NOC. The psychometric properties of the instrument were measured using the Screening for Cognitive Impairment in Psychiatry-Spanish version (SCIP-S) as the gold standard, and against the scores obtained by matched controls.


RESULTS
100 people diagnosed with schizophrenia and 100 controls participated. The battery's internal consistency was 0.70. The Pearson correlation with the SCIP-S was 0.80 (sensitivity = 0.86, specificity = 0.80). The mean T-score of those diagnosed with schizophrenia was 2.2 standard deviations below that of the controls. There were significant differences in educational level, employment, and cohabitation.


DISCUSSION
The BCog-S showed acceptable psychometric properties. It can discriminate cognitive impairment, and could be useful for establishing normative reference values.


IMPLICATIONS FOR PRACTICE
Nurses can use the BCog-S to measure cognition in people with a diagnosis of schizophrenia.