Length of previous hospital stay based on hospital records (exposure) and pressure ulcer development (outcome)
| Pressure ulcers | |||
|---|---|---|---|
| Cases | Controls | ||
| Odds in the exposed group (long hospital stay = yes) = 15/13 = 1.15 | |||
| Odds in the unexposed group (long hospital stay = no) = 5/7 = 0.71 | |||
| Odds ratio = 1.62 | |||
| Long hospital stay(>10 days) | Yes | 15 | 13 |
| No | 5 | 7 | |
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