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Figure 4. A comparison of the variation in hearing protector use with respect to sample time for subjects with PTA results better than 25 dB HL (average of 3, 4 & 6 kHz) for: (1) Group 1 n = 47 (no OAE test results); and (2) Group 2 with OAE mean CES < 7.5 dB (SPL), n = 32. Error bars show the 95% confidence interval.

Figure 4. A comparison of the variation in hearing protector use with respect to sample time for subjects
with PTA results better than 25 dB HL (average of 3, 4 & 6 kHz) for:
(1) Group 1 n = 47 (no OAE test results); and
(2) Group 2 with OAE mean CES < 7.5 dB (SPL), n = 32.
Error bars show the 95% confidence interval.