Table 1.
Clinical characteristics and results of HRV analysis as well as comparison between girls and boys by the Mann-Whitney test, and the van Elteren's test for the analysis of the influence of the interaction between age and sex on the analyzed parameters.
| Girls N = 51 | Boys N = 49 | M-W test p-value | van Elteren's test | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Median | 25th p. | 75th p. | Mean | SD | Median | 25th p. | 75th p. | |||
| Age [years] | 13.9 | 3.7 | 15.0 | 13.0 | 16.0 | 12.3 | 3.9 | 13.0 | 9.8 | 15.0 | 0.0025 | – |
| PQ [ms] | 129.0 | 14.7 | 130.0 | 120.0 | 140.0 | 129.9 | 17.8 | 130.0 | 120.0 | 142.8 | 0.6125 | 0.5654 |
| QRS [ms] | 83.8 | 8.6 | 80.0 | 80.0 | 90.0 | 87.2 | 9.0 | 90.0 | 80.0 | 91.0 | 0.0422 | 0.0001 |
| QTc [ms] | 398.1 | 16.7 | 397.0 | 387.3 | 411.5 | 387.6 | 21.7 | 390.0 | 370.8 | 400.0 | 0.0288 | 0.01394 |
| Supraventricular beats in 24-h ECG [%] | 0.000235 | 0.0009293 | 0.0 | 0.0 | 0.0 | 0.00173 | 0.006480 | 0.0 | 0.0 | 0.0 | 0.3575 | 0.05593 |
| Ventricular beats in 24-h ECG [%] | 0.000176 | 0.0005179 | 0.0 | 0.0 | 0.0 | 0.205 | 1.4248 | 0.0 | 0.0 | 0.0 | 0.9589 | 0.1525 |
| Duration of ECG recording [min] | 1287.157 | 119.5533 | 1297.832 | 1202.0 | 1385.2 | 1313.218 | 81.7335 | 1302.376 | 1259.1 | 1370.6 | 0.5372 | 0.6075 |
| Mean RR [ms] | 736.2 | 73.0 | 736.5 | 688.3 | 783.1 | 744.9 | 87.2 | 758.6 | 679.2 | 805.6 | 0.8930 | 0.0242 |
| SDNN [ms] | 159.0 | 43.1 | 161.5 | 132.6 | 190.2 | 158.0 | 39.9 | 157.1 | 126.1 | 190.3 | 0.4139 | 0.5090 |
| ULF [ms2] | 21732.3 | 12472.1 | 19582.6 | 12536.1 | 30669.4 | 19821.3 | 10731.4 | 18062.3 | 10912.7 | 26070.9 | 0.2262 | 0.8763 |
| VLF [ms2] | 3501.0 | 1648.8 | 3396.7 | 2095.2 | 4541.7 | 3928.5 | 2241.4 | 3279.0 | 2256.6 | 5845.1 | 0.8442 | 0.1359 |
| LF [ms2] | 1925.6 | 1164.9 | 1765.5 | 1072.6 | 2399.0 | 2097.8 | 1107.5 | 1723.1 | 1319.4 | 2906.1 | 0.8066 | 0.0813 |
| HF [ms2] | 1844.4 | 2077.5 | 1476.4 | 599.4 | 2139.8 | 1957.5 | 1734.5 | 1376.0 | 760.8 | 2286.6 | 0.3466 | 0.4395 |
| LF/HF [] | 1.5 | 0.7 | 1.4 | 1.1 | 1.8 | 1.5 | 0.7 | 1.3 | 0.9 | 2.1 | 0.2236 | 0.7865 |
| SD1 [ms] | 47.7 | 25.6 | 43.9 | 28.5 | 56.5 | 50.3 | 23.6 | 48.2 | 32.3 | 60.0 | 0.6766 | 0.4474 |
| SD2 [ms] | 218.3 | 58.5 | 223.7 | 179.3 | 263.7 | 216.1 | 54.5 | 210.7 | 172.2 | 261.7 | 0.7433 | 0.5152 |
| CL [%] | 95.1 | 4.3 | 96.5 | 94.2 | 97.6 | 94.4 | 4.4 | 95.9 | 93.3 | 97.2 | 0.1030 | 0.5354 |