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Hot Deck Multiple Imputation for Handling Missing Accelerometer Data

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Abstract

Missing data due to non-wear are common in accelerometer studies measuring physical activity and sedentary behavior. Accelerometer outputs are high-dimensional time-series data that are episodic and often highly skewed, presenting unique challenges for handling missing data. Common methods for missing accelerometry either are ad-hoc, require restrictive parametric assumptions, or do not appropriately impute bouts. This study developed a flexible hot-deck multiple imputation (MI; i.e., “replacing” missing data with observed values) procedure to handle missing accelerometry. For each missing segment of accelerometry, “donor pools” contained observed segments from either the same or different participants, and ten imputed segments were randomly drawn from the donor pool according to selection weights, where the donor pool and selection weight depended on variables associated with non-wear and/or accelerometer-based measures. A simulation study of 2550 women compared hot deck MI to two standard methods in the field: available case (AC) analysis (i.e., analyzing all observed accelerometry with no restriction on wear time or number of days) and complete case (CC) analysis (i.e., analyzing only participants that wore the accelerometer for ≥ 10 h for 4–7 days). This was repeated using accelerometry from the entire 24-h day and daytime (10am–8pm) only, and data were missing at random. For the entire 24-h day, MI produced less bias and better 95% confidence interval (CI) coverage than AC and CC. For the daytime only, MI produced less bias and better 95% CI coverage than AC; CC produced similar bias and 95% CI coverage, but longer 95% CIs than MI.

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Acknowledgements

The authors would like to acknowledge the following investigators in the WHI Program: Program Office: (National Heart, Lung, and Blood Institute, Bethesda, Maryland) Jacques Rossouw, Shari Ludlam, Joan McGowan, Leslie Ford, and Nancy Geller. Clinical Coordinating Center: (Fred Hutchinson Cancer Research Center, Seattle, WA) Garnet Anderson, Ross Prentice, Andrea LaCroix, and Charles Kooperberg. Investigators and Academic Centers: (Brigham and Women’s Hospital, Harvard Medical School, Boston, MA) JoAnn E. Manson; (MedStar Health Research Institute/Howard University, Washington, DC) Barbara V. Howard; (Stanford Prevention Research Center, Stanford, CA) Marcia L. Stefanick; (The Ohio State University, Columbus, OH) Rebecca Jackson; (University of Arizona, Tucson/Phoenix, AZ) Cynthia A. Thomson; (University at Buffalo, Buffalo, NY) Jean Wactawski-Wende; (University of Florida, Gainesville/Jacksonville, FL) Marian Limacher; (University of Iowa, Iowa City/Davenport, IA) Jennifer Robinson; (University of Pittsburgh, Pittsburgh, PA) Lewis Kuller; (Wake Forest University School of Medicine, Winston-Salem, NC) Sally Shumaker; (University of Nevada, Reno, NV) Robert Brunner; (University of Minnesota, Minneapolis, MN) Karen L. Margolis. Women’s Health Initiative Memory Study: (Wake Forest University School of Medicine, Winston-Salem, NC) Mark Espeland.

The authors thank Fang Wen for her assistance with the data. This research was funded by grants from National Heart, Lung, and Blood Institute, National Institutes of Health (NIH), Grant R01HL105065 (PI: LaCroix) and contracts #HHSN268201100046C, #HHSN268201100001C, #HHSN268201100002C, #HHSN268201100003C, #HHSN268201100004C, and #HHSN271201100004C. The WHI program is funded by the National Heart, Lung, and Blood Institute, NIH, through contracts #HHSN268201600018C, #HHSN268201600001C, #HHSN268201600002C, #HHSN268201600003C, and #HHSN268201600004C. The content is solely the responsibility of the authors and does not necessarily represent the views of the NIH. The results of the present study do not constitute endorsement by the authors of the products described in this paper. The results of this study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation.

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Correspondence to Nicole M. Butera.

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Butera, N.M., Li, S., Evenson, K.R. et al. Hot Deck Multiple Imputation for Handling Missing Accelerometer Data. Stat Biosci 11, 422–448 (2019). https://doi.org/10.1007/s12561-018-9225-4

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  • DOI: https://doi.org/10.1007/s12561-018-9225-4

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