Table 4.

VEP variables and UPDRS scores of the PD group.

	Patients number	Values
The duration of PD (yrs)	41	2 (0–18)
UPDRS1	41	4 (0–11)
UPDRS2	41	12.5 (3–37)
UPDRS3	41	19 (6–63)
UPDRS4	41	2 (0–11)
UPDRS total score	41	39 (14–109)
Right VEP P100 latency	40	109.23 ± 6.92
Left VEP P100 latency	41	109.3 ± 8.55
Right VEP amplitude	40	5.35 ± 2.09
Left VEP amplitude	41	5.19 ± 2.07
Right VEP N75	40	82.97 ± 11.48
Left VEP N75	41	82.67 ± 10.63
Right VEP N135	40	141.99 ± 9.65
Left VEP N135	41	145.15 ± 11.94

VEP latencies are given in milliseconds (ms) and amplitudes in microvolts (μV). Variables distributed normally were expressed as mean ± standart deviation; variables distributed non-normally were expressed as median (minimum-maximum).