15
3. Appendix
LOW FREQUENCY SLOPE
Determine the difference between the audiogram findings at 250 Hz and 500 Hz. Divide this
difference by 2. This will give you the setting for the low frequency slope.
THR
500 Hz
– THR
250 Hz
2
= dB/octave
Low frequency slope:
In this example the threshold for 500 Hz is at 60 dB and for 250 Hz at 40 dB. So the low fre-
quency slope is:
60 dB – 40 dB
2
= 10 dB/octave.
0
125
250
500
1000
2000
4000
8000
10
20
30
40
50
60
70
80
90
100
110
120
Frequency (Hz)
dB
Fig. 16 Audiogram thresholds at 250 Hz and 500 Hz
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