Originally Posted by BobZ

Component dna? It simply means comparing apples to apples when it comes to questions like the longevity of a populace.

The cdc and other research agencies publish life expectancy stats. In general, and in component groupings. They use 'race' and gender component groupings but its more accurate to speak in terms of dna groupings.

And there is a significant statistical spread in the published longevity for component dna groupings in the aggregrate US population.

The US is a varied dna populace. Our dna predisposes us to chronic illness that influence longevity.

Examining the dna grouping of japan with the comparable component group in the US is likely to reveal less of a difference than the aggregate US numbers.

And Unless the stats specifically account for only 'natural' deaths... Than other cultural and social influences between countries need to be considered in a longevity assesment.

things like relative exposure to elevated death from transportation modes, gun, prevalence of drug and alcohol as well as losses from armed conflicts would have to be accounted for in the numbers in a relative comparison to asses if the longevity difference is related to factors like diet or more to a consequence of the circumstances of day to day life.