A study of the interrelationship between and comparative interrater reliability of the SAPS, SANS and PANSS.

We assessed the comparative interrater reliability of the SANS/SAPS and PANSS as measures of symptomatology in schizophrenia and also examined the interrelationship between scores on these instruments. Two experienced raters used these Scales to assess positive and negative symptoms in a group of 85 patients with a DSM III-R diagnosis of schizophrenia. Ratings were based on structured clinical interviews, review of case notes and consultation with staff familiar with the patients. Comparable levels of interrater reliability were found for each system of measuring symptomatology, but levels of interrater reliability were on the whole lower than have been reported in the past. There were high correlations between overall indices of positive and negative symptomatology derived from the two measurement systems.