Table 3.

Differences in the amplitudes of waves I, III, and V between the case and control groups

Amplitude	Total	Group		Diff	95% CI		P value‡
		Case	Control		Lower	Upper
Wave I
Mean±SD	0.18±0.1	0.2±0.08	0.17±0.11	0.03	0.01	0.05	<0.001
Median (range)	0.17 (0.02 to 0.9)	0.2 (0.07 to 0.46)	0.16 (0.02 to 0.9)
Wave III
Mean±SD	0.42±0.17	0.55±0.14	0.29±0.1	0.25	0.23	0.27	<0.001
Median (range)	0.37 (0 to 0.87)	0.55 (0 to 0.87)	0.32 (0.1 to 0.45)
Wave V
Mean±SD	0.37±0.24	0.53±0.2	0.21±0.14	0.32	0.29	0.35	<0.001
Median (range)	0.23 (0 to 0.9)	0.53 (0 to 0.89)	0.18 (0.08 to 0.9)

^‡Based on the t test