Figure 2: Patterns of hearing loss and asymmetry by exposure to agriculture, men only. (a) Thresholds by level of exposure - summary box plots extend from the 25^th to 75^th percentiles, with a midline at the median, "+" at the mean and vertical lines extending to the 5th and 95th percentiles. (b) Mean thresholds by ear and level of exposure - shaded region extends to the mean for the low exposure group at each frequency, while "□" shows the corresponding mean for the medium exposure group and "♦" shows the corresponding mean for the high exposure group. (c) Asymmetry by level of exposure - individual subject differences between ears (left minus right) are summarized with box plots (described in a). (d) Mean asymmetry by level of exposure - for individual subjects showing at least a 5 dB change from baseline at one or more high frequencies (3-8K Hz), the mean asymmetry (left minus right ear) over the high frequencies is plotted versus the maximum change from baseline. Filled circles and the solid line show subjects with low exposures, open circles and the fine dashed line show subjects with medium exposures and squares and the heavy dashed line show subjects with high exposures. Lines illustrate trends using a cubic spline smoothing function