Scalar Amplitude Measurements of Data Recorded with Cube and Frank Leads from Normal Children

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Abstract
Amplitudes of scalar deflections were measured in records obtained with cube and Frank lead systems from 542 healthy children. Significant correlations were observed between corresponding deflections recorded with the two lead systems. There were significant correlations between amplitudes of some scalar deflections and age, chest diameter, height, and weight, but the scatter of individual values was too large to allow accurate prediction of measurements from regression equations. Means for scalar amplitude measurements showed several patterns of change from infancy through adult years. Normal limits for these measurements should, therefore, be stratified by age in children as well as in adults. Normal limits for scalar amplitudes and ratios between amplitude measurements were presented for four age groups of children. Correlation between age and body measurements was so high in these children that further stratification of normal limits on the basis of body measurements is not likely to provide additional useful information. There were differences in scalar measurements between males and females 10 to 16 years of age, but these were small.