. 2015 Oct 18;74(6):826–832. doi: 10.1016/S1808-8694(15)30142-7

Table 2.

Pre and postoperative thresholds of air and bone conduction, air-bone gap, and SRI. Group II - Mixed.

Frequency (kHz)	N	Preoperative	Postoperative	Difference	P^†
Air conduction
0,25	107	66,96 ± 13,56	37,99 ± 19,25	28,97 ± 18,22	<0,001
0,5	107	65,89 ± 14,60	35,84 ± 20,37	30,04 ± 16,94	<0,001
1	107	64,49 ± 13,73	36,59 ± 21,69	27,90 ± 17,33	<0,001
2	107	60,14 ± 15,44	37,48 ± 22,04	22,66 ± 16,02	<0,001
3	106	58,21 ± 17,27	38,63 ± 24,68	19,58 ± 17,14	<0,001
4	107	58,74 ± 18,44	44,07 ± 23,57	14,67 ± 17,24	<0,001
6	104	62,07 ± 20,55	55,63 ± 28,26	6,44 ± 19,05	<0,001
8	107	60,93 ± 22,78	57,38 ± 27,27	3,55 ± 15,77	0,010
Mean values¹	106	62,17 ± 13,07	37,18 ± 20,95	24,99 ± 15,30	<0,001
Bone conduction
0,5	107	20,14 ± 11,29	19,35 ± 12,21	0,79 ± 8,50	0,177
1	107	29,91 ± 12,70	25,47 ± 16,49	4,44 ± 10,80	<0,001
2	107	33,18 ± 15,61	28,74 ± 17,38	4,44± 10,38	<0,001
3	101	33,71 ± 15,98	28,32 ± 18,82	5,40 ± 10,31	<0,001
4	107	29,72 ± 17,40	29,07 ± 18,77	0,85 ± 9,98	0,306
Mean values¹	101	29,21 ± 12,29	25,26 ± 14,41	3,95 ± 7,36	<0,001
Air-bone gap²	100	32,90 ± 7,80	11,53 ± 10,35	21,37 ± 12,12	<0,001
SRI Vocal audiometry³	91	65,33 ± 10,48	39,23 ± 16,88	26,10 ± 14,79	<0,001

The data represent mean value ± standard deviation, in decibels.

^†

Level of significance (Student t test for paired samples) of the air and bone conduction difference thresholds.

Mean values among the frequencies of 0.5, 1, 2 and 3 kHz. When not available, the 3kHz threshold was replaced by the arythmetic average of frequencies 2 and 4 kHz.

Air and bone conduction average values difference.

Speech Recognition Index.