Table 3.
Comparison of the classification of medx system and the truth as a multiclass problem for the six most prevalent diagnoses.
| Truth (expert opinion) |
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Phobic postural vertigo | MD | VM | BPPV | BVP | DBN | VN | Other cerebellar disorders | Others | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | Accuracy (%) | ||
| Test result (medx system) | Phobic postural vertigo | 95 | 1 | 2 | 1 | 1 | 2 | 1 | 0 | 15 | 80.5 | 82.5 | 52.5 | 94.6 | 82.1 |
| MD | 9 | 84 | 4 | 3 | 3 | 0 | 2 | 0 | 3 | 77.8 | 97.6 | 87.5 | 95.3 | 94.1 | |
| VM | 49 | 8 | 35 | 2 | 0 | 0 | 1 | 0 | 6 | 34.7 | 97.8 | 76.1 | 88.3 | 87.4 | |
| BPPV | 5 | 0 | 0 | 58 | 1 | 1 | 2 | 1 | 26 | 61.7 | 98.3 | 86.6 | 93.4 | 92.6 | |
| BVP | 4 | 0 | 0 | 0 | 40 | 1 | 0 | 3 | 1 | 81.6 | 97.1 | 71.4 | 98.4 | 95.9 | |
| DBN | 7 | 1 | 1 | 0 | 1 | 32 | 0 | 3 | 1 | 69.6 | 97.7 | 71.1 | 97.5 | 95.6 | |
| VN | 2 | 2 | 1 | 2 | 2 | 1 | 11 | 0 | 5 | 42.3 | 99.0 | 64.7 | 97.5 | 96.6 | |
| Other cerebellar disorders | 3 | 0 | 2 | 0 | 3 | 5 | 0 | 12 | 1 | 46.2 | 98.8 | 63.2 | 97.6 | 96.6 | |
| Others | 7 | 0 | 1 | 1 | 5 | 3 | 0 | 0 | 25 | 59.5 | 89.8 | 30.1 | 96.8 | 87.7 | |
Benign paroxysmal positional vertigo, benign paroxysmal positional vertigo; BVP, bilateral vestibulopathy; DBN, downbeat nystagmus syndrome; MD, Menière’s disease; VM, vestibular migraine; VN, vestibular neuritis. Other cerebellar disorders: cerebellar ataxia with neuropathy and bilateral vestibular areflexia syndrome; cerebellar ataxia; episodic ataxia type 2. Others: all other diagnoses (vestibular paroxysmia; multiple system atrophy; vestibular schwannoma, perilymph fistula; progressive supranuclear palsy; brainstem stroke). Sensitivity: true positive rate, specificity: true negative rate. PPV, positive predictive value; NPV, negative predictive value.