565690.fig.001a
(a)
565690.fig.001b
(b)
565690.fig.001c
(c)
Figure 1: (a) Individual abnormality frequencies in regional Tennessee controls show a mean of 2.3 and a distribution skewed leftward. (b) The 25 hog-farm-exposed people had a symmetrical distribution of abnormalities with a mean frequency of 4.3. (c) The 22 Ohio hog-farm-distant-exposed people also had a skewed distribution of abnormalities with a mean frequency of 2.5.