The reference values given in this article are based on the data gathered from 1492 healthy children and analyzed by Davignon et al. 1. The second and 98th percentiles are given.
References
Davignon A, Rautaharju P, Boisselle E, Soumis F, Megelas M, Choquette A. Normal ECG standards for infants and children. Pediatr Cardiol 1979;1:123-31.