Quantification of tremor using consumer product accelerometry is feasible in patients with essential tremor and Parkinson’s disease: a comparative study

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 LGA^a	4.76	23.28	20.72
Distal	Reference LGA^b	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

ISSN: 2054-7072