Risque rela f: études cas-‐témoins, Arnaud Fontanet 2

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« Odds » d’être exposé chez les cas = a/(a+c) / c/(a+c) = a/c
« Odds » d’être exposé chez les témoins = b/(b+d) / d/(b+d) = b/d
Odds-ratio = (a/c) / (b/d) = ad/bc

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