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Editor's Correspondence
July 12, 2010

Analysis of Television Viewing and Physical Activity Using Time Substitution Models—Reply

Author Affiliations

Author Affiliations: Stanford Prevention Research Center, Stanford University School of Medicine, Palo Alto, California (Dr Otten); and Departments of Medicine and Nursing (Dr Littenberg) and Nutrition and Food Sciences (Dr Harvey-Berino), University of Vermont, Burlington.

Arch Intern Med. 2010;170(13):1173-1174. doi:10.1001/archinternmed.2010.211

In reply

Mekary and Ding cite their recent research article1 on isotemporal substitution paradigm as a possible model for analyzing the result of our study.2 We acknowledge that this is an interesting new model for analyzing the relative effects of replacing one activity, such as TV viewing, with another, such as brisk walking. The model appears to be most appropriate in large-scale, prospective epidemiological studies.

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