{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,5]],"date-time":"2026-02-05T16:29:21Z","timestamp":1770308961789,"version":"3.49.0"},"reference-count":58,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2025,12,4]],"date-time":"2025-12-04T00:00:00Z","timestamp":1764806400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,12,4]],"date-time":"2025-12-04T00:00:00Z","timestamp":1764806400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J intellect Disabil Res"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>Actigraphy is being increasingly used to assess sleep and circadian rhythms among populations with intellectual and developmental disabilities and genetic syndromes, including Rett syndrome and related disorders, but the reliability of these measures in these populations is unclear. The primary purpose of the current study was to evaluate the impact of recording duration on the reliability of various measures of sleep and circadian rhythm in Rett and related syndromes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Method<\/jats:title>\n                    <jats:p>Two 14\u2010day recordings were collected between 4 and 12\u2009weeks apart in a sample of 30 individuals (aged 2\u201336\u2009years; 97% female). Reliability was estimated by calculating statistics based on 3, 5, 7, 10 or 13\u201314 nights of recording.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Most measures of average sleep quality could be reliably estimated with 7\u201310 nights. Measures of night\u2010to\u2010night variability in sleep timing showed poor reliability at all recording durations, whereas night\u2010to\u2010night variability in sleep duration showed adequate reliability at 5\u20137\u2009days of recording. The reliability of measures of circadian rhythm was highly variable.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The results suggest that the optimal recording durations for actigraphy in this population vary based on the specific metrics of interest, but most can be measured reliably.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jir.70068","type":"journal-article","created":{"date-parts":[[2025,12,4]],"date-time":"2025-12-04T08:14:16Z","timestamp":1764836056000},"page":"262-273","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reliability of Actigraphy for the Assessment of Sleep and Circadian Rhythms in Rett and Related Syndromes"],"prefix":"10.1111","volume":"70","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7645-1479","authenticated-orcid":false,"given":"Breanne","family":"Byiers","sequence":"first","affiliation":[{"name":"Department of Educational Psychology University of Minnesota  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8038-3368","authenticated-orcid":false,"given":"Alyssa","family":"Merbler","sequence":"additional","affiliation":[{"name":"Department of Educational Psychology University of Minnesota  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elijah","family":"Lockhart","sequence":"additional","affiliation":[{"name":"Department of Educational Psychology University of Minnesota  Minneapolis Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1250-181X","authenticated-orcid":false,"given":"Chantel","family":"Burkitt","sequence":"additional","affiliation":[{"name":"Gillette Children's  St. Paul Minnesota USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9833-4807","authenticated-orcid":false,"given":"Frank","family":"Symons","sequence":"additional","affiliation":[{"name":"Department of Educational Psychology University of Minnesota  Minneapolis Minnesota 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