Validity of the Modified SIT-Q 7d for Estimating Sedentary Break Frequency and Duration in Home-Based Office Workers During the COVID-19 Global Pandemic: A Secondary Analysis

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Kirsten Dillon-Rossiter Faculty of Health Sciences, School of Kinesiology, The University of Western Ontario, London, ON, Canada

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Madison Hiemstra Faculty of Health Sciences, School of Kinesiology, The University of Western Ontario, London, ON, Canada

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Nina Bartmann Center for Advanced Hindsight, Duke University, Durham, NC, USA

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Wuyou Sui Behavioural Medicine Lab, Department of Exercise Science, Physical & Health Education, University of Victoria, Victoria, BC, Canada

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Marc Mitchell Faculty of Health Sciences, School of Kinesiology, The University of Western Ontario, London, ON, Canada

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Scott Rollo Healthy Active Living and Obesity Research Group, Children’s Hospital of Eastern Ontario Research Institute, Ottawa, ON, Canada
Faculty of Medicine, School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada

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Paul A. Gardiner Faculty of Health Sciences, School of Kinesiology, The University of Western Ontario, London, ON, Canada
Faculty of Health, Engineering and Sciences, School of Health & Medical Sciences, University of Southern Queensland, Toowoomba, QLD, Australia

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Harry Prapavessis Faculty of Health Sciences, School of Kinesiology, The University of Western Ontario, London, ON, Canada

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Office workers who transitioned to working from home are spending an even higher percentage of their workday sitting compared with being “in-office” and this is an emerging health concern. With many office workers continuing to work from home since the onset of the COVID-19 pandemic, it is imperative to have a validated self-report questionnaire to assess sedentary behavior, break frequency, and duration, to reduce the cost and burden of using device-based assessments. This secondary analysis study aimed to validate the modified Last 7-Day Sedentary Behavior Questionnaire (SIT-Q 7d) against an activPAL4™ device in full-time home-based “office” workers (n = 148; mean age = 44.90). Participants completed the modified SIT-Q 7d and wore an activPAL4 for a full work week. The findings showed that the modified SIT-Q 7d had low (ρ = .35–.37) and weak (ρ = .27–.28) criterion validity for accurate estimates of break frequency and break duration, respectively. The 95% limits of agreement were large for break frequency (26.85–29.01) and medium for break duration (5.81–8.47), indicating that the modified SIT-Q 7d may not be appropriate for measuring occupational sedentary behavior patterns at the individual level. Further validation is still required before confidently recommending this self-report questionnaire to be used among this population to assess breaks in sedentary time.

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