... complex diseases Nature 2009, 461:747-753 doi:10.1186/gm156 Cite this article as: Jamshidi Y, et al.: Novel genes for QTc interval How much heritability is explained, and how much is left to find? ... that the heritability of QTc is estimated to be about 50%, how much of this can be explained by the common variants discovered so far? Based on the results of the combined analysis of the top hits ... risk score 20 Figure Correlation between genetic risk score and QT interval The bars show the distribution of the risk score classes (left axis) In pink, a plot of the risk score versus unstandardized...