Table 2.
Mean values of artefact percentages and signal-to-noise ratios (SNR) for measurements using gel electrodes and the electrocardiography (ECG)-belt in clinical (data from Fontana et al. [9]) and home settings (n = 12).
| Gel Electrode, Clinics | ECG-Belt, Clinics | ECG-Belt, Home | ||
|---|---|---|---|---|
| Artefact percentages | ||||
| Mean | % | 2.9 | 9.7 | 7.5 |
| Median | % | 1.4 | 5.4 | 2.8 |
| SD | % | 4.1 | 14.7 | 10.8 |
| Inter-patient CV | % | 144.4 | 151.7 | 143.6 |
| Intra-patient CV | % | - | - | 2.8 |
| SNR | ||||
| SNRlf | dB | 12 | 0 | 11 |
| SD | dB | 5 | 5 | 2 |
| BLW | mV | 0.03 | 0.30 | 0.05 |
| SD | mV | 0.02 | 0.43 | 0.02 |
| SNRhf | dB | 21 | 17 | 21 |
| SD | dB | 3 | 6 | 5 |
SD—standard deviation; CV—coefficient of variation; Intra-patient CV was calculated as night-to-night variation; SNRlf—low frequency SNR; BLW—baseline wander; SNRhf—high frequency SNR.