Prevalences of (A) sitting and (B) television viewing in the US National Health and Nutrition Examination Survey (NHANES). *Adjusted prevalences of sitting and television viewing using the weighted average case:source prevalence ratio obtained from cohort studies of sedentary behaviour and all-cause mortality. Prevalences of (A) sitting and (B) television viewing in the US National Health and Nutrition Examination Survey (NHANES). *Adjusted prevalences of sitting and television viewing using the weighted average case:source prevalence ratio obtained from cohort studies of sedentary behaviour and all-cause mortality. Peter T Katzmarzyk, and I-Min Lee BMJ Open 2012;2:e000828 ©2012 by British Medical Journal Publishing Group