Table 1.

Results of VEP studies in two groups

VEP	COPD	Control	P-value
Right P100 latency, ms	118.2±11.9	110.2±4.4	0.001
Left P100 latency, ms	119.7±12.4	110.6±4.9	0.001
Right P100/N140 amplitude, mV	10.9±5.0	9.3±5.8	–
Left P100/N140 amplitude, mV	9.5±4.1	8.5±4.8	–

Abbreviations: COPD, chronic obstructive pulmonary disease; VEP, visual evoked potential.