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Log blood harmane concentration was also stratified into tertiles in ET cases. The mean ± SD UPSIT score in the low tertile = 32.9 ± 3.1, in the middle tertile = 31.1 ± 4.9, and in the high tertile = 27.3 ± 6.0 (difference between low and high tertile = 5.6 UPSIT points, and in a test for trend, beta = −2.79, p < 0.001). The bar represents two standard errors and the closed circle represents the mean.
