Figure 5From: Item response analysis of the Positive and Negative Syndrome Scale Option characteristic curves and expected item total score for Item 19: Mannerisms and posturing. Option characteristic curves (solid lines) and expected item total score (dashed line) are plotted as a function of scores on the General Psychopathology Subscale from the PANNS, expressed as standard normal scores (lower x-axis) and expected total scores (upper x-axis). Option characteristic curves (solid lines) overlap between Options 1 and 2 but generally well differentiated. However, options are generally only endorsed at more severe levels of symptomatology. Option 1 was most likely to be endorsed than any other option, in over half the sample, namely with individuals scoring less than 81 on the 30-item PANSS.Back to article page