Comparing comprehension and perception for speed-of-ageing and standard hazard ratio formats

A hazard ratio presents one benefit of exercise as reducing annual mortality risk by 19%. Alternatively, speed-of-ageing metaphors present this as adding 2.5 years to one’s life expectancy—equating to 1 extra hour each day—or taking 2.5 years off one’s “effective age.” Claire Heard compares these (increasingly popular) metaphors.

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Image courtesy of interviewee. August 29, 2023

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