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Figure 5. Top (exposure group I): Auditory threshold shifts (AT2 - AT1) of rats caused by exposure to toluene alone (6 h/d, 10 d). Bottom (exposure group II): Auditory threshold shifts (AT2 - AT1) of rats caused by exposure to a daily sequential combination of toluene and noise (6 + 2 h/d, 10 d). Mean SEM. * indicates that the average auditory threshold shift is significant (p< 0.05, t-test) when compared to the unexposed control (0 ppm, top).

Figure 5. Top (exposure group I): Auditory threshold shifts (AT2 - AT1) of rats caused by exposure to
toluene alone (6 h/d, 10 d). Bottom (exposure group II): Auditory threshold shifts (AT2 - AT1) of rats
caused by exposure to a daily sequential combination of toluene and noise (6 + 2 h/d, 10 d). Mean SEM.
* indicates that the average auditory threshold shift is significant (p< 0.05, t-test) when compared to the
unexposed control (0 ppm, top).