To evaluate the efficacy of the proposed features, 18 older adults over 80 years old, who provided their informed consent, were recruited from June 2019 to February 2021. Recruitment was based on two distinct populations. On the one hand, vulnerable participants, who have fallen at least once in the previous year, were recruited during a study involving nursing home permanent resident. On the other hand, the second population includes non-frail community-dwelling elderly, who have no frailty criteria according to FrP, and who were recruited by press announcements, posters placed in medical offices (notably geriatrics consultation) and by communication in retired-people association or housing facilities. The study population was perfectly balanced (50% frail subjects). On average, participants were monitored for 31.6 (± 16.5) days, leading to a total of 570-day recordings. These subjects wore the sensing device during their daily routine without any specific instruction being imposed. The corresponding acceleration and barometric data were recorded on a memory card. The research team intervened to download data and format the memory card. Table 2 illustrates some relevant demographic details of the study cohort.
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