Group A (n = 56)

Group B (n = 32)

Group C (n = 62)

p value

Mean age, yr

44.2

43.7

46.4

n.s.

Gender, % female

75.0

70.4

65.0

n.s.

Mean preop. BC, dB

22.3

22.6

17.8

n.s.

Mean preop. AC, dB

57.2

57.9

59.4

n.s.

Mean preop. ABG, dB

34.9

35.3

41.6

n.s.

Mean postop. BC, dB

23.1

22.8

18.4

n.s.

Mean postop. AC, dB

33.2

32.6

27.5

n.s.

Mean postop. ABG, dB

10.1

9.8

9.1

n.s.

PTA-ABG < 10 dB, %

86

84

88

n.s.

SNHL, dB

0

0

0

n.s.

Operation time, minutes

61.8

64.7

41.3

p < 0.0001^a

Completion of surgery,%

78.6

81.5

96.7

p < 0.004^b