|Odds in the exposed group (long hospital stay = yes) = 15/10 = 1.5|
|Odds in the unexposed group (long hospital stay = no) = 5/10 = 0.5|
|Odds ratio = odds in exposed group/odds in unexposed group = 3.0|
|Long hospital stay (>10 d)||Yes||15||10|
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Evaluation of studies of causation (aetiology)
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