Table 2.

Demographic information.

	All PD (n = 72)	Left-onset PD (n = 27)	Right-onset PD (n = 45)	Non-PD (n = 48)
Age	67.75 ± 5.86	67.19 ± 5.01	68.09 ± 6.34	68.17 ± 4.97
Education	16.28 ± 2.67	16.33 ± 2.29	16.24 ± 2.89	16.89 ± 2.24
Sex (M:F)	51:21	19:8	32:13	38:10
Disease duration	7.00 ± 4.98	5.37 ± 3.10**	7.98 ± 5.63**	–
MMSE	28.59 ± 1.33*	28.59 ± 1.34	28.58 ± 1.31	29.26 ± 0.94*
WTAR estimated IQ	109.46 ± 7.34	109.52 ± 6.92	109.40 ± 7.76	109.64 ± 8.41
UPDRS part 3	18.04 ± 10.09*	17.74 ± 8.83	18.28 ± 10.92	2.96 ± 3.57*
LED	585.07 ± 334.34*	539.00 ± 232.69	631.13 ± 435.99	0.85 ± 5.83*,a

UPDRS part 3 is the motor symptom scale of the United PD Rating Scale; LED, Levodopa equivalence score; MMSE, mini-mental state examination; WTAR, Wechsler Test of Adult Reading.

^aOne non-PD participant was taking levodopa for restless leg syndrome.

*Indicates significant PD/non-PD difference, p < 0.05.

**Indicates significant L-PD/R-PD difference, p < 0.05.