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. 2006 Sep 18;37(2):163–180. doi: 10.1017/S0033291706008750

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Copyright © Cambridge University Press 2006

The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike license <http://creativecommons.org/licenses/by-nc-sa/2.5/>. The written permission of Cambridge University Press must be obtained for commercial re-use

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Fig. 3 — Meta-analysis of association of COMT genotype with P300 amplitude and latency. Meta-analysis indicates no evidence of association between COMT genotype and P300 amplitude (a) and latency (b), with a direction of effect consistent with increased amplitude and latency in the Val/Met+Val/Val group compared to the Met/Met group. Bars represent individual study 95% confidence intervals, with a central block proportional to study size. The summary diamond bar represents the summary effect size estimate and 95% confidence interval.