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

Table 5 Mean amplitude at peak frequency measured with each consumer product accelerometer (CPA) and laboratory grade accelerometer (LGA) as reference in extended arm position based on 20 measurements

Location	Device	Mean (mG^2/Hz)	Intra-individual variability Coefficient of variation (%)	Inter-individual Coefficient of variation (%)
Distal	Reference LGA^a	38.27	27.91	322.91
Distal	Reference LGA ^b	20.31	37.26	316.00
Distal	iPhone 7	149.77	44.39	328.17
Distal	iPod Touch 5	869.93	51.00	403.96
Distal	Huawei Nexus 6P	666.42	66.79	407.66
Distal	MW Clip	1656.51	90.70	400.59
Proximal	Apple Watch 2	31.62	42.57	376.02
Proximal	Huawei Watch	67.34	124.33	431.74
Proximal	MW Watch	34.24	37.74	374.98

^aReference LGA measurement prior to CPA hand-held devices ^bReference LGA measurement prior to CPA wrist-worn devices

ISSN: 2054-7072