Table 2.
Electrocardiographic measurements per age groups.
| Age (years) | Overall | Group 1: | Group 2: | Group 3: | Group 4: | Group 5: | Group 6: |
|---|---|---|---|---|---|---|---|
| 7–8 | 9–10 | 11–12 | 13–14 | 15–16 | 17–18 | ||
| n (%) | 2,151 (100) | 141 (7) | 448 (21) | 524 (24) | 546 (25) | 383 (18) | 109 (5) |
| HR (bpm) | 68.8 ± 12.8 p <0.001 | 80.8 ± 13.2 [54; 109] [2,3,4,5,6] |
74.2 ± 12.5 [52; 101] [3,4,5,6] |
70.2 ± 11.4 [50; 96] [4,5,6] |
66.3 ± 11.3 [47; 93] [5,6] |
62.5 ± 11.2 [44; 88] |
59.5 ± 10.2 [43; 82] |
| P dur (msec) | 69.2 ± 18.3 p = 0.019 | 66.2 ± 16.6 [34; 93] |
68.0 ± 18.6 [35; 93] |
68.5 ± 18.0 [37; 94] | 69.7 ± 17.9 [39; 95] |
71.4 ± 19.0 [42; 97] |
71.1 ± 20.3 [44; 99] |
| PR (msec) | 136.7 ± 26.8 p = 0.001 | 132.5 ± 24.8 [101; 178] [5,6] |
134.1 ± 26.5 [105; 179] [5,6] |
136.0 ± 24.6 [107; 180] |
136.5 ± 28.6 [109; 184] |
140.6 ± 25.1 [112; 188] |
142.7 ± 33.8 [115; 193] |
| QRS (msec) | 90.9 ± 10.4 p <0.001 | 87.4 ± 8.5 [71; 106] [4,5,6] |
87.0 ± 9.0 [72; 108] [3,4,5,6] |
89.1 ± 10.3 [74; 111] [4,5,6] |
91.6 ± 9.8 [76; 113] [5,6] |
96.2 ± 10.2 [79; 115] |
97.8 ± 9.7 [81; 117] |
| QT (msec) | 377.9 ± 30.0 p <0.001 | 355.9 ± 25.4 [312; 413] [2,3,4,5,6] |
367.9 ± 29.8 [319; 424] [3,4,5,6] |
375.1 ± 26.2 [325; 434] [4,5,6] |
383.1 ± 29.5 [330; 442] [5,6] |
389.7 ± 28.6 [332; 448] |
393.1 ± 29.5 [333; 452] |
| QTc (msec) | 395.9 ± 23.3 p = 0.003 | 397.2 ± 19.8 [355; 439] |
397.5 ± 20.5 [355; 440] [6] |
396.9 ± 21.4 [355; 440] [6] |
396.4 ± 20.6 [353; 438] [6] |
393.6 ± 21.2 [349; 434] |
389.9 ± 23.3 [344; 430] |
Data expressed as mean ± sd [2nd; 98th percentile].
[]p < 0.05 current group vs. Group J, pairwise comparisons with Bonferroni adjustment for multiple comparisons.
HR, heart rate; P dur, P-wave duration.