Table 2.
The ECG parameters of the study population on the date of ECG examination (n = 55,529).
| ECG parameter | Mean ± SD or percent |
|---|---|
| Minnesota codes | |
| MC 4a | 6 |
| MC 5b | 16 |
| MC 4 or MC 5c | 18 |
| T-wave amplitude (μV) | |
| Lead I | 202 ± 105 |
| Lead II | 241 ± 105 |
| Lead aVL | 86 ± 93 |
| Lead V1 | −14 ± 116 |
| Lead V2 | 313 ± 197 |
| Lead V3 | 349 ± 203 |
| Lead V4 | 324 ± 193 |
| Lead V5 | 284 ± 167 |
| Lead V6 | 221 ± 126 |
| ST-segment amplitude (μV) | |
| Lead I | 13 ± 21 |
| Lead II | 19 ± 25 |
| Lead aVL | 4 ± 17 |
| Lead V1 | 27 ± 27 |
| Lead V2 | 64 ± 46 |
| Lead V3 | 47 ± 41 |
| Lead V4 | 29 ± 35 |
| Lead V5 | 18 ± 29 |
| Lead V6 | 11 ± 23 |
| QRS/T angles and heart rate | |
| Heart rate (beats/min) | 66 ± 10 |
| QRS/T angle–spatial (°) | 60 ± 28 |
| QRS/T angle–frontal plane (°) | 29 ± 27 |
a
Any ST abnormality (MC 4.1–4.4).
b
Any T abnormality (MC 5.1–5.4).
c
Any ST–T abnormality (MC 4.1–4.4 or MC 5.1–5.4).