Steven N Blair Guest Blog
When comparing US deaths from low fitness and ‘Smokadiabesity’, remember that attributable fractions are based on the prevalence of the risk factor as well as the relative risk. In the Aerobics Centre Longitudinal Study (1) the smoking prevalence is substantially lower than in the U.S. (I think probably less than half the U.S. rate).
I do not know how much difference this would make, but I doubt that ‘low fitness’ – cardiorespiratory fitness would account for more deaths than smokadiabesity in national data.
I recommend we currently limit conclusions from the ACLS (1) to that setting and I recommend against extrapolating to the national population.
Khan, KM. 2009. Mid-year review: physical inactivity universally accepted as the biggest public health problem of the 21st century, shoulder exam challenges, and progress against the scourges of anterior knee pain and ACL injuries. BJSM, 43:469-470. (Free Online!)
Steven N. Blair is a Professor in the Departments of Exercise Science Epidemiology/Biostatistics at the University of South Carolina