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Number of ventricular premature contraction on screening electrocardiograms (ECGs). On screening ECGs, 76% of first graders and 77% of seventh graders have one or two ventricular premature contractions (VPCs). A part of the patients showed many VPCs (three or more VPCs) on screening ECGs. The ratio was 24% in first graders and 23% in seventh graders
