High Pressure Air Jet in the Endoscopic Preparation Room: Risk of Noise Exposure on Occupational Health

Table 2

The expected risk of hearing loss (>2.5 dB) was significantly higher after 7 years than in 2 years of the noise exposure period for the endoscopic preparation nurse.

Age	31 years old
Working experience	7 years
Exposure years	2 years
Basic sound level	80 dBA
Exposed noise	90 dBA	95 dBA	100 dBA
Hearing loss	>2.5 dB
Accumulated exposure period
If 2 years	0.1%	0.5%	1.4%
If 7 years	2.15%	11.6%	51.3%

The odds ratio was 49.1 with 95% confidence interval from 11.9 to 203.6 (http://www.hutchon.net/ConfidORselect.htm).