TABLE 1.

Demographic characteristics.

Variable	20 Hz tVAS (n = 11)	40 Hz tVAS (n = 12)	p-value
Sex (male, %)	5, 45	8, 66	0.414a
Age (years)	64.5 ± 8.2	61.5 ± 5.3	0.298b
Education level (years)	13.4 ± 3.2	14.2 ± 2.6	0.519b

^aObtained from a chi-square test.

^bObtained from an independent t-test.