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Differential Accuracy of Physical Activity Self-Report by Body Mass Index

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Objectives: To examine whether agreement between self-reported and accelerometer-measured physical activity varies by BMI category in a low-income black sample. Methods: Participants completed a questionnaire and wore an accelerometer for 4-6 days. Using one- and 10-minute bouts, accelerometers measured light, moderate, and vigorous physical activity time. Results: Correlations varied by obesity (nonobese: one-minute r=0.41; 10-minute r=0.47; obese: one-minute r=0.21; 10-minute r=0 .14). Agreement was highest among nonobese persons (one-minute kappa = 0.48, 10-minute kappa = 0.023; obese: one-minute kappa = -0.024, 10- minute kappa = -0.020). Conclusions: We found compromised questionnaire performance among obese participants.


Document Type: Research Article


Affiliations: 1: Department of Epidemiology, Human Development and Health, Harvard School of Public Health, Boston, MA, USA 2: Division of Public Health Sciences, Department of Surgery, Washington University School of Medicine, Saint Louis, MO, USA. 3: Department of Society, Human Development and Health, Harvard School of Public Health, Boston, MA, USA 4: Health and Human Performance, Montana State University, Bozeman, MT, USA 5: Senior Data Technician, Global Health Institute, Duke University, Department Psychology and Neuroscience, Durham, NC, USA 6: Duke University, Department Psychology and Neuroscience, Durham, NC, USA

Publication date: 2012-03-01

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  • The American Journal of Health Behavior seeks to improve the quality of life through multidisciplinary health efforts in fostering a better understanding of the multidimensional nature of both individuals and social systems as they relate to health behaviors.

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