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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

From: Noise exposure during prehospital emergency physicians work on Mobile Emergency Care Units and Helicopter Emergency Medical Services

  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