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Post a reply: Converting WHO reference median to z-scores

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I sometimes see exclusion criteria in papers expressed as weight for length (WFL) < 75% or <80% of WHO reference median. I can't figure out how to convert this to z-scores, so can't figure out what subjects the paper is studying.

Apologies if this is an old question - I see some discussion on this some years back, but I haven't managed to find an answer.

Many thanks.

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