Figure 1
COMQ-12 ROC curve.
Commentary: The area under the ROC curve (0.987) signifies outstanding diagnostic accuracy. A threshold score of 7 was determined to distinguish between chronic otitis media and a healthy ear. The ROC curve was created by plotting PCOMQ-12 and CTCOMQ-12.
Figure 2
DHI ROC curve.
Commentary: The area under the ROC curve (0.999) signifies outstanding diagnostic accuracy. A threshold score of 9 was determined for the recognition of vertigo. The ROC curve was created by plotting PTDHI and CDHI.
Figure 3
NVI ROC curve.
Commentary: The area under the ROC curve (0.781) signifies acceptable diagnostic accuracy. A threshold score of 56 was determined for the recognition of vertigo. The ROC curve was created by plotting PTNVI and CNVI.
Table 1
Test-retest reliability, discriminant validity, internal consistency, cut-off value and Youden’s index for the COMQ-12, DHI, NVI and THI.
| Test-retest reliability | Discriminant validity | α | AROC | Cut-off value | J | |
|---|---|---|---|---|---|---|
| COMQ-12 | p=0.680*, ICCA=0.858 (0.774–0.912)** | p<0.0005 † | 0.796 | 0.987 | 7 | 0.90 |
| DHI | ICCA=0.946 (0.902–0.969)** | p<0.0005 † | 0.910 | 0.999 | 9 | 0.95 |
| NVI | p=0.315‡, ICCA=0.975 (0.959–0.985)** | p<0.0005 ‡‡ | 0.950 | 0.781 | 56 | 0.43 |
| THI | p=0.120* | p<0.0005 † | 0.924 | 1.000 | 7 | 1.00 |
Legend: α, Cronbach’s alpha; AROC, area under ROC curve; J, Youden’s index; p, p-value;
**, type A intraclass correlation coefficient estimates and their 95% confident intervals using an absolute agreement definition, based on single measures and two-way mixed effects (ICCA);
Commentary: statistical significance is p<0.05. As the minimum NVI score is 28, the cut-off value is higher compared to the other questionnaires.
Figure 4
THI ROC curve.
Commentary: The area under the ROC curve (1.000) signifies perfect diagnostic accuracy. A threshold score of 7 was determined for the recognition of tinnitus. The ROC curve was created by plotting PTHI and CTTHI.