This study aims to validate the Lithuanian version of the Brief Negative Symptoms Scale, Calgary Depression Scale for Schizophrenia, and Schizophrenia Cognition Rating Scale in a Lithuanian sample. This will be done by comparing results obtained from the Brief Negative Symptoms Scale, Calgary Depression Scale for Schizophrenia, and Schizophrenia Cognition Rating Scale with results obtained from the Positive and Negative Symptoms Scale, the Montgomery Asberg Depression Rating Scale, and the Montreal Cognitive Assessment test.
age 18 - 65 years old;
Diagnosis of F20, F25 or F21 according to ICD-10;
Signed informed consent form.
Age younger than 18 or older than 65 years old;
Did not sign the informed consent form;
Legally inactive person
Patients with a comorbid or primary diagnosis of mental retardation according to ICD-10 (F70 - F79);