Table I.

Pre-exposure thresholds and TTS2 in the three groups. Mean values and standard deviation (SD) are shown. ANOVA test was used to compare groups.

	Threshold 3 kHz pre		Threshold 4 kHz pre		Threshold 6 kHz pre		TTS2 3 kHz		TTS2 4 kHz		TTS2 6 kHz
	Mean (dB HL)	SD	Mean (dB HL)	SD	Mean (dB HL)	SD	Mean (dB HL)	SD	Mean (dB HL)	SD	Mean (dB HL)	SD
Group A	-0.9	3.5	-2.8	4.9	9.5	5.2	5.8	4.5	10.4	7.9	15.6	7.3
Group B	1.5	5.4	-2.4	4.9	4.8	5.9	6.5	3.7	11.7	4.2	14.1	5.6
Group C	5.2	8.4	-0.1	6.5	8.6	6.5	4.9	6.1	10.9	6.5	7.3	7.6
p	0.1007		0.424		0.1886		0.129		0.521		0.004