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Editor's Correspondence |

Is Sitting Harmful to Health? It Is Too Early to Say—Reply

Hidde P. van der Ploeg, PhD; Emily Banks, MBBS, PhD; Adrian Bauman, MBBS, PhD
Arch Intern Med. 2012;172(16):1272-1273. doi:10.1001/archinternmed.2012.2953.
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The responses to our recent article on sitting time and mortality1 highlight the interest in, and potential importance of, sedentary behaviors and health. Our original article found that prolonged sitting was associated with increased all-cause mortality risk, independent of physical activity.1 A study limitation was the relatively short follow-up time (mean, 2.8 years), potentially leading to confounding by occult disease. However, findings persisted after adjustments (for demographic variables, physical activity, body mass index, smoking, self-rated health, and disability), chronic disease stratification, and sensitivity analyses excluding deaths in the first year. Nevertheless, neither reverse causality due to occult disease nor residual confounding could be completely excluded.1

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Correspondence

September 10, 2012
Chittaranjan Andrade, MD; Praveen Fernandes, MD
Arch Intern Med. 2012;172(16):1272-1273. doi:10.1001/archinternmed.2012.2539.
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