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Simulation of risk of SSI: length of hospital stay before the surgery and stroke.
| Type of patient | Expected risk of SSI (%) | Number of patients | Observed SSI | Observed risk of SSI (%) |
|---|---|---|---|---|
| No stroke and length of stay up to 4 days | 1.9 | 177 | 2 | 1.1 |
| No stroke and length of stay more than 4 days | 5.9 | 233 | 15 | 6.4 |
| Previous stroke and length of stay up to four daysa | 8.6 | 8 | – | – |
| Previous stroke and length of stay more than four daysa | 23.6 | 14 | – | – |
Small sample size.
