Surgical Results of Retrograde Mastoidectomy with Primary Reconstruction of the Ear Canal and Mastoid Cavity
Table 4
Comparison of hearing gains at various frequencies with respect to the type of tympanoplasty that was performed.
Hearing gain
Type I ( = 23)
Type III-c ( = 11)
Type III-i ( = 49)
Type IV-c ( = 12)
Type IV-i ( = 7)
valueb
Post hoc
Mean
SD
Mean
SD
Mean
SD
Mean
SD
Mean
SD
ACc
250 Hz
1.09
13.65
0.71
7.27
9.32
0.03
8.96
13.15
<0.001
4.58
12.70
0.24
2.14
4.88
0.29
0.13
III-i > I
500 Hz
−0.22
13.94
0.94
8.64
12.86
0.05
9.08
14.85
<0.001
4.58
10.33
0.15
4.29
10.18
0.31
0.11
III-i > I
1000 Hz
3.04
15.65
0.36
11.36
14.33
0.03
9.59
15.64
<0.001
−0.42
9.88
0.89
0.71
5.35
0.74
0.08
III-i > IV-c
2000 Hz
0.65
16.60
0.85
8.64
11.42
0.03
10.00
16.65
<0.001
−3.75
13.51
0.36
3.57
9.88
0.38
0.03
III-i > I, IV-c
4000 Hz
−0.22
16.89
0.95
3.64
11.20
0.31
4.59
15.97
0.05
5.00
16.65
0.32
2.86
7.56
0.36
0.79
—
8000 Hz
−6.09
18.34
0.13
−8.18
14.37
0.09
0.31
15.46
0.89
−3.33
8.62
0.21
−5.00
12.25
0.32
0.34
—
ABGd
500 Hz
5.00
13.90
0.10
12.27
13.30
0.01
8.57
13.19
<0.001
6.25
10.03
0.05
3.57
9.45
0.36
0.48
—
1000 Hz
6.96
15.13
0.04
12.73
13.11
0.01
8.98
13.07
<0.001
2.08
8.91
0.44
−0.71
8.86
0.84
0.13
III-c > IV-i
2000 Hz
3.48
14.96
0.28
9.64
10.32
0.01
10.00
10.85
<0.001
1.67
11.93
0.64
1.43
15.20
0.81
0.07
III-i > I, IV-c
4000 Hz
4.78
16.13
0.17
7.73
12.12
0.06
4.90
11.92
0.01
5.00
12.79
0.20
1.43
8.99
0.69
0.91
—
represented as significant level of paired -test.
b value represented as significant level of ANOVA test, post hoc by LSD.
cAC: air conduction.
dABG: air-bone gap.
