Table 4.
Area Under the ROC Curve for PIQ Item Bank T-Scores as Predictors of Itch Severity
| AUC |
||||
|---|---|---|---|---|
| Itch severity | Item bank 1 | Item bank 2 | Item bank 3 | Item bank 4 |
|
| ||||
| Worst itch | ||||
| Moderate vs. mild | 0.66 | 0.76 | 0.72 | 0.72 |
| Severe vs. mild | 0.82 | 0.92 | 0.87 | 0.85 |
| Severe vs. moderate | 0.68 | 0.75 | 0.71 | 0.69 |
| Very severe vs. mild | 0.89 | 0.95 | 0.92 | 0.93 |
| Very severe vs. moderate | 0.80 | 0.85 | 0.83 | 0.82 |
| Very severe vs. severe | 0.66 | 0.70 | 0.70 | 0.69 |
| Average itch | ||||
| Moderate vs. mild | 0.67 | 0.74 | 0.72 | 0.73 |
| Severe vs. mild | 0.86 | 0.93 | 0.89 | 0.88 |
| Severe vs. moderate | 0.74 | 0.77 | 0.78 | 0.73 |
| Very severe vs. mild | 0.89 | 0.94 | 0.91 | 0.91 |
| Very severe vs. moderate | 0.81 | 0.85 | 0.85 | 0.80 |
| Very severe vs. severe | 0.66 | 0.69 | 0.68 | 0.64 |
Abbreviations: AUC, area under the curve; PIQ, Patient-Reported Outcomes Measurement Information System Itch Questionnaire; ROC, receiver operating characteristic.