Chart 2.

Distribution of the tonal auditory thresholds and the difference among them before and after treatment, confidence interval and p-value for each frequency in both ears (n=19).

	Frequency	Pretreatment mean value	Post-treatment mean value	Difference between the mean values	Confidence interval	p-value
	250 Hz	21,57	23,15	1,58	−6,12 2,96	0,47
	500 Hz	19,47	22,10	2,63	−7,47 2,21	0,26
	1 KHz	21,84	23,68	1,84	−6,40 2,71	0,40
RE	2 KHz	27,89	31,31	3,42	−8,44 1,59	0,16
	3 KHz	37,11	42,36	5,25	−12,00 1,48	0,18
	4 KHz	45,00	52,89	7,89	−15,31 −0,47	0,38
	6 KHz	62,10	55,00	−7,10	−0,27 14,48	0,58
	8 KHz	62,89	55,79	−7,10	0,13 14,07	0,04
	250 Hz	21,84	21,57	−0,27	−2,57 3,10	0,84
	500 Hz	17,63	17,89	0,26	−2,86 2,33	0,83
	1 KHz	18,68	20,78	2,10	−4,27 0,06	0,05
LE	2 KHz	26,05	27,63	1,58	−3,85 0,70	0,16
	3 KHz	36,57	34,47	−2,10	−0,82 5,03	0,14
	4 KHz	45,26	43,68	−1,58	−1,32 4,48	0,26
	6 KHz	53,15	51,31	−1,84	−2,02 5,71	0,33
	8 KHz	55,00	62,89	7,89	−14,18 −1,60	0,01