Differences in efficiency of earplugs and earmuffs measured as hearing impairments from two workshops.
D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold / Q000502:physiology; D004430:Ear Protective Devices / Q000592:standards*; D006317:Hearing Loss, Noise-Induced / Q000175:diagnosis*; D006801:Humans; D008297:Male; D009623:Noise, Occupational; D011446:Prospective Studies; D011482:Protective Devices / Q000592:standards*; D012189:Retrospective Studies