Table 2.

Wave latencies for waves I, III, and V in the case and control groups

Latency	Total	Group		Diff	95% CI		P value‡
		Case	Control		Lower	Upper
Absolute latency wave I
Mean±SD	1.54±0.09	1.53±0.09	1.54±0.09	0.01	0.02	0.01	0.464
Median (range)	1.55 (1.14 to 1.73)	1.53 (1.39 to 1.73)	1.56 (1.14 to 1.73)
Absolute latency wave III
Mean±SD	3.65±0.16	3.65±0.16	3.64±0.16	0.00	0.02	0.03	0.807
Median (range)	3.68 (3.3 to 3.83)	3.68 (3.3 to 3.83)	3.68 (3.3 to 3.83)
Absolute latency wave V
Mean±SD	5.71±0.42	5.7±0.42	5.72±0.41	0.02	0.09	0.05	0.550
Median (range)	5.87 (4.66 to 6.45)	5.87 (4.66 to 6.45)	5.87 (4.66 to 6.45)
Interpeak latency IV
Mean±SD	4.12±0.32	4.12±0.32	4.12±0.32	0.00	0.05	0.05	1.000

^‡Based on the t test