Figure 1.

The Mean Hearing Thresholds over six frequencies (250 Hz, 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz, 8000 Hz) pre- and post- alcohol consumption, to give a breath alcohol concentration of 30 u/l or more, (subjects a-z ranked). The trend for the maximum hearing threshold change (mean 15 ± 7 dB) is reflected by the lower coloured (i.e. post alcohol) area of the graph.