Evid Based Nurs 7:36-40 doi:10.1136/ebn.7.2.36
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Evaluation of studies of causation (aetiology)

Table 2

Self reported length of previous hospital stay (exposure) and pressure ulcer development (outcome)

Pressure ulcers
Cases Controls
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
No 5 10

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