... purposes)Child and Adolescent Psychiatry and Mental HealthOpen AccessResearchBaseline values from the electrocardiograms of children and adolescents with ADHDSuyash Prasad*1,2, Amanda J Furr3,4, ... het-erogeneity that may exist in physiology across ethnicgroups [16].There are a number of strengths and limitations of the meta-analysis. The considerable size and heterogeneity of the sample ... drawnalong the downslopes of the T wave and the isoelectricline. U waves were ignored, but if a U wave or abnormal Twave obscured the offset of the T wave, then the offset of the QT interval...