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Glossary Item

Rapporto tra odds

Pubblicato mercoledì 23 Aprile 2014
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Odds ratio – E’ una misura di effetto o di associazione relativa (per esempio di un test diagnostico, di una terapia, di un fattore di rischio) che approssima il rischio relativo in determinate condizioni. Esprime il rapporto tra l’odds di esito negli esposti (ovvero il rapporto tra numero di esiti esposti e numero di non-esiti esposti) e l’odds di esito nei non esposti. Un OR pari a 1 denota una mancanza di associazione (su scala moltiplicativa) tra esposizione ed esito (in quanto l’occorrenza di esito non varia al variare dell’esposizione). Valori maggiori di 1 denotano un’associazione positiva (la presenza di esposizione si associa a una maggiore occorrenza dell’esito) e viceversa per valori minori di 1. –

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