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Nonetheless, no study to date has investigated the minimum number of days required to reliably estimate the average daily steps through commercial smartwatches in people with PD. Fifty-six patients were monitored through a commercial smartwatch for 5 consecutive days. The total daily steps for each day was recorded and the average daily steps was calculated as well as the working and weekend days average steps. The intraclass correlation coefficient (ICC) (3,k), standard error of measurement (SEM), Bland\u2013Altman statistics, and minimum detectable change (MDC) were used to evaluate the reliability of the step count for every combination of 2\u20135 days. The threshold for acceptability was set at an ICC \u2265 0.8 with a lower bound of CI 95% \u2265 0.75 and a SAM &lt; 10%. ANOVA and Mann\u2013Whitney tests were used to compare steps across the days and between the working and weekend days, respectively. Four days were needed to achieve an acceptable reliability (ICC range: 0.84\u20130.90; SAM range: 7.8\u20139.4%). In addition, daily steps did not significantly differ across the days and between the working and weekend days. These findings could support the use of step count as a walking activity index and could be relevant to developing monitoring, preventive, and rehabilitation strategies for people with PD.<\/jats:p>","DOI":"10.3390\/s23218971","type":"journal-article","created":{"date-parts":[[2023,11,4]],"date-time":"2023-11-04T15:41:41Z","timestamp":1699112501000},"page":"8971","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Four Days Are Enough to Provide a Reliable Daily Step Count in Mild to Moderate Parkinson\u2019s Disease through a Commercial Smartwatch"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7955-3369","authenticated-orcid":false,"given":"Edoardo","family":"Bianchini","sequence":"first","affiliation":[{"name":"Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), Sapienza University of Rome, 00189 Rome, Italy"},{"name":"AGEIS, Universit\u00e9 Grenoble Alpes, 38000 Grenoble, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Silvia","family":"Galli","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), Sapienza University of Rome, 00189 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marika","family":"Alborghetti","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), Sapienza University of Rome, 00189 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lanfranco","family":"De Carolis","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), Sapienza University of Rome, 00189 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0227-1993","authenticated-orcid":false,"given":"Alessandro","family":"Zampogna","sequence":"additional","affiliation":[{"name":"Department of Human Neurosciences, Sapienza University of Rome, 00185 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4813-3868","authenticated-orcid":false,"given":"Clint","family":"Hansen","sequence":"additional","affiliation":[{"name":"Department of Neurology, Kiel University, 24105 Kiel, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3773-393X","authenticated-orcid":false,"given":"Nicolas","family":"Vuillerme","sequence":"additional","affiliation":[{"name":"AGEIS, Universit\u00e9 Grenoble Alpes, 38000 Grenoble, France"},{"name":"LabCom Telecom4Health, Orange Labs & Universit\u00e9 Grenoble Alpes, CNRS, Inria, Grenoble INP-UGA, 38000 Grenoble, France"},{"name":"Institut Universitaire de France, 75005 Paris, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9903-5550","authenticated-orcid":false,"given":"Antonio","family":"Suppa","sequence":"additional","affiliation":[{"name":"Department of Human Neurosciences, Sapienza University of Rome, 00185 Rome, Italy"},{"name":"IRCCS Neuromed Institute, 86077 Pozzilli, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesco E.","family":"Pontieri","sequence":"additional","affiliation":[{"name":"Department of Neuroscience, Mental Health and Sensory Organs (NESMOS), Sapienza University of Rome, 00189 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,11,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"548","DOI":"10.1001\/jama.2019.22360","article-title":"Diagnosis and Treatment of Parkinson Disease: A Review","volume":"323","author":"Armstrong","year":"2020","journal-title":"JAMA"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"17013","DOI":"10.1038\/nrdp.2017.13","article-title":"Parkinson Disease","volume":"3","author":"Poewe","year":"2017","journal-title":"Nat. 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