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 | |