The Positive and Negative Syndrome Scale (PANSS) is a rating scale, designed on the premise that schizophrenia comprises of: positive syndrome, pertaining to productive symptoms; and negative syndrome, pertaining to deficit features (Depp et al, 2010). This clinical tool is employed: 1) upon an inpatient’s admission 2) at the outset of taking a new medication and 3) weeks/ months into treatment to gauge the effect of the intervention (Opler et al., 2006). PANSS has been published officially across 40 languages following internationally valued and sanctioned guidelines under the Multi Health Systems (MHS) Translation Policy (Khan et al, 2013). Validation studies conducted in 1994, conducted reliability and validity studies among 100 DSM-III-R schizophrenic patients. Cuesta and Peralta (1994) much like Opler (1987) found that the scores were normally distributed; while the construct validity was adequate, the positive and negative subscales when compared to Scales for the Assessment of Positive/Negative Symptoms, depicted high criterion validity. However the internal consistency was insufficient and factorial validity of the positive scale was poor. The scale was seemingly developed on the basis of independent components; furthermore, it oversimplified the negative and positive symptoms. PANSS has since had alternate versions released – PANSS – SCI which accompanies a structured clinical interview and IQ –PANSS, which acquires information from informants such as family/case workers (MHS, 2006). Despite complications with respect to length and ability to measure cognitive functioning, PANSS is considered a competent “stand-alone” clinical screening tool for psychosis due to its clinical predicting power and outcome.
Newer studies communicate the following psychometric properties:
Adequate Internal consistencies for positive (α = 0.73: Acceptable), negative (α = 0.83: Good), and general psychopathology (α = 0.79: Good) subscales. Good test-retest reliability with Pearson correlation coefficients at 0.80, 0.68, and 0.60 for the positive, negative and psychopathology subscales. Positive and negative scales showed good inter-rater reliability. Interclass correlation coefficients of 0.72 and 0.80, respectively. Inter-rater reliability was moderate (0.56) for the general psychopathology scale.
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Khan, A., Christian Yavorsky, C., Liechti, S., Opler, M., Rothman, B., Diclemente, G., Lucic, L., Jovic, S., Inada, T. and Yang, L. (2013). Available at: http://A rasch model to test the cross-cultural validity in the positive and negative syndrome scale (PANSS) across six geo-cultural groups [Accessed 17 Sep. 2017].
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