To me it seems to depend on how big the age bins are. If the stratification is by 5-year intervals, then you've got ~32 groups that you're randomizing participants into. That might make your study into a prospective cohort, 'randomized' by whoever is enrolled first
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And if you're stratifying "by age" which is actually what the study in question reported, surely you'd basically just break your whole randomization? Is there something I'm missing here?
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