Measuring Physical Activity in a Cardiac Rehabilitation Population Using a Smartphone-Based Questionnaire
BackgroundQuestionnaires are commonly used to assess physical activity in large population-based studies because of their low cost and convenience. Many self-report physical activity questionnaires have been shown to be valid and reliable measures, but they are subject to measurement errors and misr...
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JMIR Publications,
2013-03-01T00:00:00Z.
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