Table 3 describes the parameters of each AA and AD symptom; item characteristic curves are depicted in Figure 3. Consistent with its low endorsement rate, the difficulty parameter estimate for LP was relatively high (3rd of 11). However, the discrimination parameter estimate of LP was the lowest among all items, indicating that it is less effective at distinguishing individuals at different levels of liability. Several of the items’ difficulty parameters cluster quite closely together (e.g., A4, D4, D5) but overall they cover a range of liabilities or vulnerability.
