Fig. 7
From: Large-scale music events can cause subclinical hearing damage
Individual auditory changes on day 1 post-exposure for various hearing parameters, plotted as a function of hearing protection device-compensated total exposure level (LAeq, comp). Gray and white symbols denote non-protected and protected festival attendees, respectively. Panels A and B illustrate temporary threshold shifts (TTS) at OSHA-defined frequencies (2–4 kHz) and 6 kHz, the red line indicating a clinically significant TTS of 10 dB. Panels C, D, E, and F depict the deterioration in DPOAE 8 kHz amplitudes, click-ABR (80 dB peSPL) wave I amplitudes, and EFR magnitudes at 4 kHz and 6 kHz, respectively. The shaded areas represent mean 95% confidence intervals (CIs) from a test–retest study with 15 participants50, while in D, E and F, additional dashed lines delineate the overall CI, capturing the average range alongside the 95%CI at each individual data point, derived from individual standard deviations obtained through a resampling bootstrapping method49.
