Table 4

Comparison of interpeak latencies (IPL) (ms) and amplitude ratio (V/I) of BAEP of the left ear between drug abusers (n=58) and controls (n=30).

IPL of left ear	Cases		Controls		t-value	p-value
	Mean	SD	Mean	SD
I-III	2.28	0.39	2.09	0.19	2.50	0.01^*
I-V	4.13	0.44	3.93	0.31	2.20	0.03^*
III-V	1.98	0.41	1.79	0.31	2.20	0.03^*
V/I	161.97	265.41	179.50	139.4	0.34	0.74^**