Table 1 Mean hearing thresholds (dB Hearing Level (dB HL)) for responders and nonresponders

Right ear (Hz)

250

500

1000

2000

3000

4000

6000

8000

Responders

20.00 (9.07)

20.56 (11.10)

21.67 (13.93)

30.56 (19.77)

42.50 (22.64)

49.44 (22.02)

55.28 (21.59)

56.67 (22.62)

Nonresponders

20.29 (9.10)

26.47 (16.28)

27.94 (18.96)

34.12 (21.30)

47.35 (22.78)

56.47 (21.63)

60.59 (21.71)

60.59 (20.61)

Left ear (Hz)

250

500

1000

2000

3000

4000

6000

8000

Responders

20.00 (9.39)

21.67 (11.50)

20.56 (13.27)

33.06 (20.23)

42.78 (22.24)

47.78 (20.16)

52.50 (18.65)

56.67 (22.94)

Nonresponders

20.88 (9.72)

22.65 (10.91)

23.82 (12.81)

34.41 (16.00)

45.29 (19.88)

55.29 (21.83)

60.59 (19.03)

57.65 (16.97)