Fig. 1
From: Insomnia and hearing impairment among occupational noise exposed male workers
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40557-017-0195-7/MediaObjects/40557_2017_195_Fig1_HTML.gif)
Hearing thresholds of the subjects according to insomnia. * Bar: the mean of hearing threshold of the both ear at all frequency
From: Insomnia and hearing impairment among occupational noise exposed male workers
Hearing thresholds of the subjects according to insomnia. * Bar: the mean of hearing threshold of the both ear at all frequency