Table 2.
Comparison of heart rate and interval measurements on 12-lead ECG and 6‑lead mECG
| 12-lead ECG | mECG | ||||||
|---|---|---|---|---|---|---|---|
| Variable | N | Mean ± SD | N | Mean ± SD | Mean difference ± SD | Mean absolute difference ± SD | Pearson correlation coefficient |
| Heart rate, bpm | 234 | 69 ± 15 | 233 | 78 ± 17 | 9 ± 8 | 10 ± 7 | 0.882 |
| PR interval, ms | 217 | 167 ± 29 | 213 | 161 ± 28 | −5 ± 20 | 16 ± 13 | 0.763 |
| QRS duration, ms | 234 | 99 ± 16 | 233 | 97 ± 17 | −3 ± 14 | 11 ± 8 | 0.639 |
| QTc (lead I), ms | 191 | 395 ± 30 | 201 | 396 ± 30 | 1 ± 19 | 14 ± 13 | 0.783 |
| QTc (lead II), ms | 231 | 406 ± 31 | 203 | 401 ± 30 | −3 ± 16 | 12 ± 9 | 0.856 |
ECG electrocardiogram; mECG mobile electrocardiogram; SD standard deviation; QTc heart rate–corrected QT interval