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Imputing Accelerometer Nonwear Time When Assessing Moderate to Vigorous Physical Activity in Children.
- Source :
- Journal of Physical Activity & Health; Nov2017, Vol. 14 Issue 11, p852-860, 9p
- Publication Year :
- 2017
-
Abstract
- Background: A limitation of accelerometer measures of moderate to vigorous physical activity (MVPA) is nonwear time. Nonwear-time data is typically deleted prior to estimating MVPA. In this study, we used an approach that used sociodemographic, health, and time data to guide the imputation of nonwear-time data. We determined whether imputing nonweartime data influences estimates of MVPA and the association between MVPA, body mass index, and blood pressure. Methods: Seven days of accelerometer data were collected on 332 children aged 10-13 years. MVPA was estimated in a "nonimputed dataset," wherein nonwear-time data were deleted prior to estimating MVPA, and in an "imputed dataset," wherein nonwear-time data were imputed using sociodemographic and health characteristics of participants and time characteristics of the nonwear period prior to estimating MVPA. Results: Nonwear time represented 7% of waking hours. Average MVPA estimates did not differ in the nonimputed and imputed datasets (56.8 vs 58.4 min/d). The strength of the relationship between MVPA and the 2 health outcomes did not differ in the nonimputed and imputed datasets. Conclusions: Studies achieving high accelerometer wear-time compliance can obtain MVPA estimates without substantial bias if they use the traditional approach of deleting nonwear-time data. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15433080
- Volume :
- 14
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Journal of Physical Activity & Health
- Publication Type :
- Academic Journal
- Accession number :
- 125835614
- Full Text :
- https://doi.org/10.1123/jpah.2016-0706