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Figure 3. Compound (CTS) and permanent threshold shift (PTS) versus frequencies, ranging from 2 kHz to 32 kHz, obtained from styrene-exposed animals (n = 13: exposed and control young rats; n = 14: exposed and control aged rats). Styrene exposure: 700 ppm, 6 h/d, 5 d/w, 4 w. Each point represents the mean and the bars represent the 95% half-confidence intervals.

Figure 3. Compound (CTS) and permanent threshold shift (PTS) versus frequencies, ranging from 2
kHz to 32 kHz, obtained from styrene-exposed animals (n = 13: exposed and control young rats; n =
14: exposed and control aged rats). Styrene exposure: 700 ppm, 6 h/d, 5 d/w, 4 w. Each point represents
the mean and the bars represent the 95% half-confidence intervals.