Table 5.

Comparison of visual evoked potential parameters between cases and controls

Visual evoked potential	Parameters	Cases (n=30)	Controls (n=10)	Total (n=40)	P
P100 latency right	Mean (SD)	95 (8)	93 (4)	94 (7)	0.89
	Median (IQR)	93 (88-101)	92 (90-94)	92 (89-101)
	Range	83-116	87-101	83-116
P100 amplitude right	Mean (SD)	6.4 (2.4)	5.9 (1.2)	6.3 (2.1)	0.233
	Median (IQR)	6.7 (5.5-7.9)	6.3 (5.3-6.8)	6.6 (5.4-7.8)
	Range	1.4-9.8	3.5-7.2	1.4-9.8
P100 latency left	Mean (SD)	95 (9)	96 (5)	95 (8)	0.77
	Median (IQR)	94 (88-102)	98 (93-99)	95 (88-101)
	Range	81-116	86-101	81-116
P100 amplitude left	Mean (SD)	6.9 (1.9)	6.2 (1.3)	6.8 (1.8)	0.331
	Median (IQR)	6.9 (5.4-8.7)	6.6 (5.4-6.9)	6.9 (5.4-8.4)
	Range	3.5-9.7	3.7-7.8	3.5-9.7

IQR=interquartile range, SD=standard deviation