Table 3.

Background characteristics of the healthy control and age‐ and sex‐matched selected IRBD patients.

	Heathy controls	IRBD patients	p‐value
N	34	34	N/A
Age, years	64.0 ± 5.3	64.3 ± 5.3	0.65
Sex (males/females)	20/14	20/14	N/A
MMSE	28.6 ± 1.6	27.9 ± 2.0	0.06
RBDSQ‐J	1.5 ± 1.0	6.9 ± 3.3*	p < 0.001
UPSIT‐J	30.7 ± 4.3	17.6 ± 5.3	p < 0.001
OSIT‐J	9.9 ± 1.3	2.1 ± 1.4	p < 0.001

IRBD, isolated REM sleep behavior disorder; MMSE, Mini Mental State Examination; OSIT‐J, Odor Stick Identification Test for Japanese; RBDSQ‐J, REM sleep behavior screening scale for Japanese; UPSIT‐J, Japanese version of the 40‐item University of Pennsylvania Smell Identification Test™; p‐value, Mann–Whitney Test; N/A, not available; *, n = 22.