Table 4.

Comparison Between Normal and Affected According to Flash VEP Including P2 (ms), N1P1 (μv) and N2P2 (μv)

Flash VEP	Normal (n =30)	Affected (n =30)	t	p
P2 (ms)
Mean ± SD.	115.8 ± 3.4	143.6 ± 15.6	7.067*	<0.001*
Median (Min. – Max.)	116 (110–120)	145 (121–170)
N1P1 (μv)
Mean ± SD.	6.1 ± 1	3.9 ± 1.9	5.802*	<0.001*
Median (Min. – Max.)	6(4.5–8)	3.7(1–6)
N2P2 (μv)
Mean ± SD.	17.9 ± 3.2	7.9 ± 3.4	7.017*	<0.001*
Median (Min. – Max.)	17.5(13–23.5)	9.5(1.6–12)

Note: *Statistically significant at p ≤ 0.05.

Abbreviations: t, paired t-test; p, p value for comparing between normal and affected.