Table 7.
Results from ROC Curve Analyses for EBQ Total and subscale scores.
| Sample | EBQ-18 Scale | Cut-Off Score | Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) | AUC (95% CI) |
|---|---|---|---|---|---|---|---|
| BN/BED (n = 54) vs. Control (n = 61) | EBQ-18 Total Score | >45 | 92.59 (82.1–97.9) | 93.44 (84.1–98.2) | 92.6 (82.9–97.0) | 93.4 (84.7–97.3) | 0.98 ** (0.93–0.99) |
| Negative Beliefs Scale | >16 | 88.89 (77.4–95.8) | 88.52 (77.8–95.3) | 87.3 (77.2–93.3) | 90.0 (80.8–95.1) | 0.95 ** (0.89–0.98) | |
| Positive Beliefs Scale | >14 | 90.74 (79.7–96.9) | 93.44 (84.1–98.2) | 92.5 (82.6–96.9) | 91.9 (83.1–96.3) | 0.97 ** (0.92–0.99) | |
| Permissive Beliefs Scale | >13 | 81.48 (68.6–90.7) | 70.49 (57.4–81.5) | 71.0 (61.9–78.6) | 81.1 (70.6–88.5) | 0.83 ** (0.75–0.89) |
EBQ-18 = Eating Beliefs Questionnaire 18-item version, CI = Confidence Intervals, PPV = Positive predictive value, NPV = Negative predictive value, AUC = Area under the curve, BN/BED = Combined bulimia nervosa and binge eating disorder subgroup sample, ** = p < 0.001.