Table 2.

Accuracies of lateralization as compared with NP (%).

Classification categories		Correct rate	Errora rate	p-value
By the fast phase directions	Spontaneous nystagmus	90.4%	9.6%	0.007
	Supine positioning nystagmus	93.3%	6.7%	0.021
	Bow nystagmus	97.4%	2.6%	0.224
	Lean nystagmus	95.8%	4.2%	0.092
By the more vigorous DCPN in the SRT	without supine positioning nystagmus	100%	0%	–
	with supine positioning nystagmus	58.7%	41.3%	<0.001

^aThe errors included incorrect and difficult lateralization.