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Distribution of beat-to-beat QTc intervals (corrected using Bazett’s formula) in healthy individuals, LQT1 and LQT2 patients. Distributions were normalized (same area), so “Count” is a normalized count of cardiac beats. LQT3 cohort was not plotted because of its small size. Note the overlap of LQT1 and LQT2 groups with the healthy population indicating the level of concealment in these populations.
