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Table 3 Mean and standard deviation of hearing level in dB for each frequency at baseline and mean and standard deviation of change in hearing level (average of R & L ear).

From: A prospective study of hearing changes after beginning zidovudine or didanosine in HIV-1 treatment-naïve people

Frequency (Hz) Baseline – All subjects (dB) Baseline – Subjects with follow up (dB) Change at 16 wks* (dB) Change at 32 wks* (dB)
Number of subjects 33 23 22 19
250 13.3 +/- 8.0 14.8 +/- 8.3 -1.6 +/- 5.1 -2.1 +/- 5.1
500 11.3 +/- 8.6 12.7 +/- 9.8 -0.6 +/- 5.1 -2.1 +/- 5.1
1000 11.2 +/- 9.8 11.4 +/- 11.3 -0.6 +/- 3.2 0.0 +/- 3.0
2000 9.6 +/- 12.0 11.3 +/- 13.1 -0.5 +/- 3.9 0.0 +/- 2.8
3000 13.6 +/- 13.7 16.1 +/- 14.8 -0.3 +/- 4.5 0.0 +/- 2.8
4000 17.4 +/- 14.9 19.1 +/- 15.8 -0.9 +/- 4.5 -1.1 +/- 5.7
6000 20.5 +/- 13.7 22.6 +/- 14.7 0.6 +/- 5.6 -0.2 +/- 6.9
8000 23.4 +/- 14.5 25.0 +/- 15.0 -2.2 +/- 5.6 -0.4 +/- 7.2
12000 36.3 +/- 19.7 37.9 +/- 19.1 -0.6 +/- 8.4 0.0 +/- 11.4
Low Freq PTA 11.5 +/- 9.8 12.1 +/- 10.8 -0.6 +/- 2.5 -0.9 +/- 2.0
High Freq PTA 20.4 +/- 13.4 22.2 +/- 14.2 -0.8 +/- 4.8 -0.6 +/- 5.2
  1. *A negative value indicates improved hearing and a positive value indicates worse hearing