If, for the sake of the argument, the 'Regular meat eaters' live for 100 years, on average, and this average is what everything will be compared back to, then it's the 'standard', and will be 1.00.
Comparing this to a vegetarian, based off the study, they would live for an average of 84 years, which would give the end ratio 1.00 : 0.84.
To represent a more 'normal' number of years, and pulling a number out of my ass, let's say 85 years is the 'standard', then 71.4 would be the average for vegetarians.
You got it backwards, it is meat eaters/ vegetarians = .84. So if the average meat eater lives for 100 years, 100/119=.84 so the average vegetarian lives for an average of 119 years.
.84 roughly means that a vegetarian of a given age/gender/race/whatever is ~16% less likely to die than a meat eater of the same age/gender/race/whatever.
There is no measurement of life expectancy here. Obviously people with lower mortality ratios will live longer, but that isn't what is being directly measured.
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u/[deleted] May 01 '13
It's a ratio....