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Subanalysis showing reduced data set. A total of 243 children were randomly selected, 81 in each age group (young, mid, old) of whom 27 in each HR group (low, mid, high HR group). No effect of age on RMSSD was observed (all p > 0.25). Within the three age groups, RMSSD was significantly different between the HR groups (all p < 0.01).
