Table 5.
Sub-analysis: HRV parameters of randomly selected children specifically grouped according to heart rate within age groups.
| Young (2–3.5 years) | Mid (3.5–4.2 years) | Old (4.2–6 years) | p-value | |
|---|---|---|---|---|
| HR (beats.min−1) | 85.8 (80.7; 91.6) | 86.7 (79.3; 92.0) | 85.5 (78.0; 90.9) | 0.49* |
| RMSSD (ms) | 61.9 (35.8; 95.0) | 64.6 (40.4; 97.5) | 53.9 (33.3; 82.6) | 0.33 |
| SDNN (ms) | 46.9 (30.6; 74.3) | 53.2. (36.5; 81.2) | 44.8 (30.4; 67.7) | 0.33 |
| HF power (ms2) | 1,479 (570; 3,684) | 1,679 (818; 3,524) | 1,350 (665; 2,775) | 0.59 |
| LF power (ms2) | 236 (106; 557) | 296 (121; 751) | 221 (100; 574) | 0.30 |
| LF/HF | 0.19 (0.11; 0.26) | 0.17 (0.11; 0.30) | 0.15 (0.10; 0.27) | 0.48 |
| Total Power (ms2) | 1,947 (711; 4,668) | 2,225 (974; 5,100) | 1,711 (766; 3,781) | 0.71 |
| DFA alpha 1 | 0.55 (0.45; 0.63) | 0.54 (0.46; 0.63) | 0.55 (0.45; 0.64) | 0.81 |
Abbreviations as in Table 3.
Medians (interquartile ranges) are shown. p-values are from Kruskal–Wallis testing. 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).
*
Please note there is no difference in HR between the three age groups because groups were specifically formed with regard to HR.