Table 4.

PTA (3, 4 and 6 kHz combined) hearing thresholds with MECU physicians as reference group. PTA adjusted for sex and age. No pure-tone audiometry was done in HEMS physicians

	PTA hearing threshold (dB) [95% CI]	P-values	Mean PTA hearing threshold (dB)	Number of measurements	Active service years
Sex (coefficient) ref. female	5 [0;10]	0.05
Age (years)	1 [0;1]	0.001
MECU Physicians	Ref.		24	12	10
In-hospital controls	1 [−2;9]	0.27	15	10	15
EMTs	3 [−5;6]	0.81	17	39	13