An ECG was taken on each of 683 apparently healthy children. Flat, inverted or diphasic T or P waves never occurred in Lead I, rarely occurred in Lead II and frequently occurred in Lead III.

The QRS interval tends to be shorter in children than in adults and increases with age from 6 months to 9 years. Measurements less than 0.04 sec. or greater than 0.08 sec. are rare in healthy children under the age of 9 years.

The PR (PQ) interval tends to be shorter in children than in adults and increases with age from 6 months to 9 years. PR (PQ) intervals of 0.15 sec. or more are rare in healthy children under the age of 4 years. PR (PQ) intervals of 0.16 sec. or more are very rare in healthy children from 4 to 9 years of age.

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