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. 2011 May 10;8(5):1478–1490. doi: 10.3390/ijerph8051478

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 2. — Center Frequency (Cf) Analysis. The mean Cf for the tremors are significantly higher in Welders compared to PD under all conditions (right vs. left) and (resting vs. postural); paired two-tailed t-test (p = 0.009). The mean Cf of the postural tremors are higher in the welders compared patients with ET, but does not reach statistical significance. However, the Cf of the rest tremors in welders are significantly higher than in patients with ET. 2-way ANOVA of Cf of the ET group showed that rest vs. posture, but not right vs. left, contributed significantly to total variance (p = 0.009). The grey bands indicate the range of the mean Cf for each group of subjects and are intended to facilitate visual comparisons.