Table 3.

All measurements with MECU exposure as reference. Data are adjusted for noise floor and DPOAE amplitude signal. All included participants had recordable emissions exceeding S/N of 7 dB at baseline. The listed values are changes (Δ) from baseline values. P < 0.05 in bold

	Δ dB response at 2 kHz [95% CI]	Δ dB response at 3 kHz [95% CI]	Δ dB response at 4 kHz [95% CI]	Number of measurements (per 2, 3 4 kHz)
MECU exposure [reference]
Ambulance exposure	−6 [−10;-3]	0 [−6;0]	0 [−5;4]	106 (39, 39, 28)
HEMS exposure	−6 [−13;0]	−3 [−13;2]	−7 [−17;1]	77 (39, 19, 19)
In-hospital exposure	4 [−1;10]	1 [−11;7]	5 [−5;13]	52 (31, 6, 15)