Table 3.
Summary of intertechnician and interposition variability
| Parameter | Variance component | Coefficient of variation (%) |
| Heart rate | Between-technicians | 5.2 |
| (bpm) | Between-positions | 3.0 |
| Within-animals | 7.9 | |
| PR | Between-technicians | 1.4 |
| (ms) | Between-positions | 2.2 |
| Within-animals | 5.9 | |
| P width | Between-technicians | 1.8 |
| (ms) | Between-positions | 6.8 |
| Within-animals | 8.2 | |
| QRS | Between-technicians | 0.4 |
| (ms) | Between-positions | 0.0 |
| Within-animals | 9.2 | |
| QT | Between-technicians | 3.1 |
| (ms) | Between-positions | 1.4 |
| Within-animals | 9.7 | |
| QTcb | Between-technicians | 0.1 |
| (ms) | Between-positions | 0.0 |
| Within-animals | 6.9 | |
| QTcf | Between-technicians | 1.3 |
| (ms) | Between-positions | 0.5 |
| Within-animals | 7.7 | |
| RR | Between-technicians | 5.4 |
| (ms) | Between-positions | 2.8 |
| Within-animals | 8.4 | |
| R amplitude | Between-technicians | 1.2 |
| (mV) | Between-positions | 11.1 |
| Within-animals | 23.7 | |
| ST elevation | Between-technicians | 7.2 |
| (mV) | Between-positions | 35.7 |
| Within-animals | 43.0 | |
| P amplitude | Between-technicians | 3.1 |
| (mV) | Between-positions | 12.1 |
| Within-animals | 17.5 |
A total of 192 observations were included in each assessment.
Between-animal variation was omitted from this table; it was expected that interanimal differences would exist.