Table 5 Factors analysis related to hearing preservation allocated by tumor morphology in serviceable hearing patients

Tumor volume(cc)

0.82 ± 0.03

2.8 ± 0.3

3.1 ± 0.2

P < 0.001

Length of tumor in IAC(mm)

0.71 ± 0.03

0.43 ± 0.03

0.05 ± 0.03

P < 0.01

Width of tumor in IAC(mm)

0.48 ± 0.05

0.44 ± 0.03

0.1 ± 0.05

P < 0.01

% of BS compression

0.98 ± 0.04

0.75 ± 0.06

0.71 ± 0.04

P < 0.05

% of 4th ventricle compression

0.96 ± 0.07

0.81 ± 0.03

0.67 ± 0.04

P < 0.01

Peripheral dosage (Gy)

12

12

12

NA

Cochlea (Gy)

4.1 ± 0.3

3.6 ± 0.3

1.2 ± 0.2

P < 0.01

Lateral semicircular canal (Gy)

2.8 ± 0.2

2.7 ± 0.3

1.1 ± 0.1

P < 0.01

Medial semicircular canal (Gy)

2.7 ± 0.2

2.6 ± 0.2

1.2 ± 0.1

P < 0.01

Inferior semicircular canal (Gy)

2.8 ± 0.3

2.9 ± 0.5

1.2 ± 0.2

P < 0.01

BS dosage (Gy)

2.3 ± 0.1

9.1 ± 0.2

8.6 ± 0.3

P < 0.01

10 Gy volume in BS (Gy)

0.01 ± 0.005

0.17 ± 0.04

0.23 ± 0.03

P < 0.01

Percentage in peripheral (%)

50

50

50

NA