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Higher maximal QTc in KCNQ1 p.T224M variant carriers (black bars) vs noncarriers (white bars). Group, QTc max±SD and N are shown below bars. C=p.T224M carrier; NC=noncarrier of p.T224M. TOTAL=men and women. The normal QTc for men is <450 ms; for women <460 ms. P values for comparisons: *<0.0001, **0.34, and ***0.0005.
