Table 4.

Performance of the BPPV prediction model

	Number of appropriate items (prediction score)
	0	1	2	3
Derivation set (N = 141), n (%)
DHT + BPPV	1 (1)	2 (8)	4 (15)	5 (42)
Others*	75 (99)	24 (92)	23 (85)	7 (58)
Validation set (N = 61), n (%)
DHT + BPPV	1 (3)	0 (0)	2 (13)	3 (38)
Others*	30 (97)	7 (100)	13 (87)	5 (63)

Notes: With a threshold of 0.5, the positive predictive value (PPV) and negative predictive value (NPV) for the derivation set were 16.9% and 98.7%, respectively, and those for the validation set were 16.7% and 96.8%, respectively. With a threshold of 1.5, PPV and NPV for the derivation set were 23.1% and 97.1%, respectively, and those for the validation set were 21.7% and 97.4%, respectively. With a threshold of 2.5, PPV and NPV for the derivation set were 41.7% and 94.6%, respectively, and those for the validation set were 37.5% and 94.3%, respectively.

^*Others include DHT − BPPV and non-BPPV.

Abbreviations: BPPV, benign paroxysmal positional vertigo; DHT+, positive Dix– Hallpike test; DHT−, negative Dix–Hallpike test.