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Figure 2. PTS versus frequencies obtained after 750ppm styrene exposure, 97dB octave band noise centred at 8kHz and simultaneous noise and styrene exposures for 6h/d, 5d/w, 4w. The arithmetic sum of the effects of noise and styrene is plotted. The bars represent the 95% confidence intervals.

Figure 2. PTS versus frequencies obtained after 750ppm styrene exposure, 97dB octave band noise
centred at 8kHz and simultaneous noise and styrene exposures for 6h/d, 5d/w, 4w. The arithmetic sum
of the effects of noise and styrene is plotted. The bars represent the 95% confidence intervals.