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

Table 1

Body mass index and pressure ulcers in a hypothetical sample of 3000 nursing home residents

Pressure ulcer Total
Yes No
Body mass Low (<20kg/m2) 116 1484 1600
index High (⩾20kg/m2) 74 1326 1400
Total 190 2810 3000

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