Psychiatric morbidity in schizophrenic relatives--use of Self-Reporting Questionnaires (SRQ).

A validated study of the Self-Reporting Questionnaire (SRQ-20) of the World Health Organization against ICD-9 was found to have good validation indices at the cut-off point of 5/6. The sensitivity was 84.8% and specificity 83.7%. However, SRQ-24 had poor validation indices and are too sensitive to detect psychotic illness. Twenty-three per cent of 264 schizophrenic relatives who had been staying together with them and or actively involved in their care for at least one year had neurotic disorders compared with 1% who had latent schizophrenia. The prevalence of psychiatric morbidity was higher in the first-degree relatives compared with non-first degree relatives.