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Multivariate-adjusted hazard ratios for total mortality rate and mortality due to cardiovascular disease (CVD), coronary heart disease (CHD), and non-CVD causes. Mortality end points were associated with age-, sex-, race-, and R-R interval–adjusted QT interval (QTrras) and Bazett heart rate–corrected QT interval (QTb) using restricted quadratic splines. The horizontal dotted line indicates a hazard ratio of 1. Adjustment factors are described in Figure 1.
