Table 2.
Mean peak frequency L1 norm measured with each consumer product accelerometer (CPA) and laboratory grade accelerometer (LGA) as reference in resting arm position based on 20 patients
| Location | Device | Mean Peak Frequency (Hz) | Intra-individual variability Coefficient of variation (%) |
Inter-individual variability Coefficient of variation (%) |
|---|---|---|---|---|
| Distal | Reference LGAa | 4.76 | 23.28 | 20.72 |
| Distal | Reference LGAb | 5.45 | 9.23 | 29.52 |
| Distal | iPhone 7 | 5.29 | 8.66 | 23.19 |
| Distal | iPod Touch 5 | 5.44 | 10.77 | 24.32 |
| Distal | Huawei Nexus 6P | 5.6 | 8.79 | 24.89 |
| Distal | MW Clip | 5.4 | 10.98 | 24.18 |
| Proximal | Apple Watch 2 | 5.48 | 14.93 | 25.36 |
| Proximal | Huawei Watch | 4.81 | 18.45 | 32.27 |
| Proximal | MW Watch | 4.79 | 15.30 | 21.61 |
aReference LGA measurement prior to CPA hand-held devices bReference LGA measurement prior to CPA wrist-worn devices