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Compound (CTS) and permanent threshold shift (PTS) versus frequencies, ranging from 2 kHz to 32 kHz, obtained from styrene-exposed rats. Animals have the same weight (345g) but different age: 14 vs. 24 weeks old. 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.

Compound (CTS) and permanent threshold shift (PTS) versus frequencies, ranging from 2
kHz to 32 kHz, obtained from styrene-exposed rats. Animals have the same weight (345g) but different
age: 14 vs. 24 weeks old. 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.