The Korean Version of the Schizophrenia Cognition Rating Scale: Reliability and Validity

Abstract

ObjectiveThis study's aim was to develop and standardize a Korean version (SCoRS-K) of the Schizophrenia Cognition Rating Scale (SCoRS), which is used to evaluate the degree of cognitive dysfunction affecting the everyday functioning of people with schizophrenia.MethodsEighty-four schizophrenia patients with stable symptoms who were receiving outpatient treatment and rehabilitation therapy, and 29 demographically matched non-patient controls, participated in the study. Demographic data were collected, and clinical symptoms, cognitive function, and social function were evaluated to verify SCoRS-K's reliability and validity. Clinical symptoms were evaluated using the Positive and Negative Syndrome Scale and the Clinical Global Impression-Schizophrenia Scale. Cognitive function was evaluated using a short form of the Korean Wechsler Adult Intelligence Scale and the Wisconsin Card Sorting Test (WCST). Social function was evaluated using the Social and Occupational Functioning Assessment Scale, the Schizophrenia Quality of Life Scale, and the Social Functioning Scale.ResultsData analysis demonstrated SCoRS-K's statistically significant reliability and validity. SCoRS-K has high internal consistency (Cronbach's alpha; patient 0.941, informant 0.905, interviewer 0.964); test-retest reliability [patient 0.428 (p=0.003), informant 0.502 (p<0.001), interviewer 0.602 (p<0.001); and global rating 0.642 (p<0.001)]. The mean scores of subjects were significantly higher than those of the controls (p<0.001), demonstrating SCoRS-K's discriminant validity. Significant correlations between the total scores and global rating score of SCoRS-K and those of the scales and tests listed above (except WCST) support SCoRS-K's concurrent validity.ConclusionSCoRS-K is a useful instrument for evaluating the degree of cognitive dysfunction in Korean schizophrenia patients.

Correlation between Performance-Based and Interview-Based Cognitive Measurements in Patients with Schizophrenia

“…Complete administration of the SCoRS also involves an interview with an informant (someone in regular contact with the patient). We used the Korean version, SCoRS-K, presented in our previous validation study [ 20 ].…”

“…We used the Korean version, SCoRS-K, presented in our previous validation study. 20 In this study, due to the insufficient number of informant and patient ratings, we used only the interviewer ratings. The interviewer's global rating of the SCoRS was considered the main outcome measure.…”

European Psychiatric Association guidance on assessment of cognitive impairment in schizophrenia

“…MSCEIT-ME represents to date the only measure that assesses emotional regulation, a subdomain of the emotional processing domain. Italian [173]; Chinese [159]; Malay [159], Japanese [161]. ER-40 [174] Computer administered task that assesses facial emotion recognition ability.…”

A Retrospective Study on the Relationship Between Cognitive Function and Social Function in Patients With Schizophrenia

“…Moreover, this study revealed a relationship between verbal fluency and employment. A study conducted by Kang et al reported a significant correlation between the Schizophrenia Cognitive Rating Scale and the Social and Occupational Functioning Assessment Scale in patients with schizophrenia [ 42 ]. Furthermore, McGurk et al conducted cognitive function training for patients with severe psychiatric disorders, mainly schizophrenia, and found that the employment rate of the training group was significantly higher than the non-training group after 1 year [ 12 ].…”