Figure 3

Option characteristic curves and expected item total score for Item 3: Hallucinatory behavior. Option characteristic curves (solid lines) and expected item total score (dashed line) are plotted as a function of scores on the Positive Symptomatology Subscale form the PANNS, expressed as standard normal scores (lower x-axis) and expected total scores (upper x-axis). Option characteristic curves (solid lines) indicate that a number of opportunities for improvement. Options 2, 3 and 4 overlap substantially as do Options 6 and 7 suggesting rating these options is inherently difficult for raters.