TABLE 2.

Analysis of positional nystagmus during the first phase

	HC-BPPV			PC-BPPV
	mSPV, Mean ± SD), deg/s	Duration Mean ± SD, s	Tc, Mean ± SD, s	mSPV, Mean ± SD, deg/s	Duration, Mean ± SD, s	Tc, Mean ± SD, s
Without reversal	41.78 ± 19.21	20.59 ± 7.51	5.70 ± 1.79	17.82 ± 7.76	12.86 ± 3.92	4.66 ± 1.53
With reversal	51.28 ± 17.76	19.16 ± 6.48	4.91 ± 1.53	26.82 ± 13.90	14.23 ± 5.16	4.59 ± 1.32
t	2.05	−0.82	1.71	2.65	0.99	−1.45
p	0.04	0.42	0.09	0.01	0.33	0.89

BPPV indicates benign paroxysmal positional vertigo; HC-BPPV, horizontal canal BPPV; mSPV, maximum slow-phase velocity; PC-BPPV, posterior canal BPPV; SD, standard deviation; Tc, time constant.