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. 2017 Dec 6;25:119. doi: 10.1186/s13049-017-0459-9

Fig. 1.

Fig. 1

Coefficients for Noise exposure levels from the linear mixed model with “in-hospital” as reference. Error bars indicating 95% confidence interval. All exposure groups were significant larger than in-hospital controls. The horizontal bar at 80 dB represents the acceptable threshold for occupational noise as defined in the E.U. Regulative for Noise