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Figure 4 Effect of corrected QT interval (QTc) (A) and diagnostic score (B) on yield of genetic test. (A) The yield ranged from 0% when the subject’s QTc was <400 ms to 62% when the QTc was >480 ms (p < 0.0001). (B) The greatest yield (72%) was achieved among the subset with a cumulative diagnostic score of 4, indicating strong clinical probability for long QT syndrome.