Variability of Total Step Activity in Children With Cerebral Palsy: Influence of Definition of a Day on Participant Retention Within the Study

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aut.relation.issue1en_NZ
aut.relation.journalBMC Research Notesen_NZ
aut.relation.volume9en_NZ
aut.researcherMudge, Suzie
dc.contributor.authorWilson, NCen_NZ
dc.contributor.authorMudge, Sen_NZ
dc.contributor.authorStott, NSen_NZ
dc.date.accessioned2019-02-04T02:42:26Z
dc.date.available2019-02-04T02:42:26Z
dc.date.copyright2016en_NZ
dc.date.issued2016en_NZ
dc.description.abstractBackground: Activity monitoring is important to establish accurate daily physical activity levels in children with cerebral palsy (CP). However, few studies address issues around inclusion or exclusion of step count data; in particular, how a valid day should be defined and what impact different lengths of monitoring have on retention of participant data within a study. This study assessed how different 'valid day' definitions influenced inclusion of participant data in final analyses and the subsequent variability of the data. Results: Sixty-nine children with CP were fitted with a StepWatch™ Activity Monitor and instructed to wear it for a week. Data analysis used two broad definitions of a day, based on either number of steps in a 24 h monitoring period or the number of hours of recorded activity in a 24 h monitoring period. Eight children either did not use the monitor, or used it for only 1 day. The remaining 61 children provided 2 valid days of monitoring defined as >100 recorded steps per 24 h period and 55 (90 %) completed 2 valid days of monitoring with ≥10 h recorded activity per 24 h period. Performance variability in daily step count was lower across 2 days of monitoring when a valid day was defined as ≥10 h recorded activity per 24 h period (ICC = 0.765) and, higher when the definition >100 recorded steps per 24 h period (ICC = 0.62). Only 46 participants (75 %) completed 5 days of monitoring with >100 recorded steps per 24 h period and only 23 (38 %) achieved 5 days of monitoring with ≥10 h recorded activity per 24 h period. Datasets of participants who functioned at GMFCS level II were differentially excluded when the criteria for inclusion in final analysis was 5 valid days of ≥10 h recorded activity per 24 h period, leaving datasets available for only 8 of 32 participant datasets retained in the study. Conclusion: We conclude that changes in definition of a valid day have significant impacts on both inclusion of participant data in final analysis and measured variability of total step count.en_NZ
dc.identifier.citationBMC research notes, 9(1), 411.
dc.identifier.doi10.1186/s13104-016-2218-9en_NZ
dc.identifier.issn1756-0500en_NZ
dc.identifier.urihttps://hdl.handle.net/10292/12218
dc.languageengen_NZ
dc.publisherBioMed Central Ltd.en_NZ
dc.relation.urihttps://bmcresnotes.biomedcentral.com/articles/10.1186/s13104-016-2218-9
dc.rights© 2016 Wilson et al.. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/ publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
dc.rights.accessrightsOpenAccessen_NZ
dc.subjectAccelerometryen_NZ
dc.subjectPhysical activityen_NZ
dc.subjectPhysical disabilityen_NZ
dc.subjectYouthen_NZ
dc.titleVariability of Total Step Activity in Children With Cerebral Palsy: Influence of Definition of a Day on Participant Retention Within the Studyen_NZ
dc.typeJournal Article
pubs.elements-id209844
pubs.organisational-data/AUT
pubs.organisational-data/AUT/Health & Environmental Science
pubs.organisational-data/AUT/Health & Environmental Science/Clinical Sciences
pubs.organisational-data/AUT/PBRF
pubs.organisational-data/AUT/PBRF/PBRF Health and Environmental Sciences
pubs.organisational-data/AUT/PBRF/PBRF Health and Environmental Sciences/HH Clinical Sciences 2018 PBRF
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