Data on patient admissions for surgery, operations and adverse outcomes (Leiden University Medical Centre, 1997–2005)
| Year | Admissions | Age | Women (%) | ASA at surgery ≥3 (%) | Surgical complexity ≥5 (%) | Admissions with ≥1 adverse outcome | ||
| Mean (SD) | n | % | % | |||||
| 1997 | 2315 | 47.3 (20.8) | 48.2 | 14.6 | 30.3 | 343 | 14.7 | 15.8 |
| 1998 | 2203 | 46.7 (21.2) | 49.2 | 15.4 | 26.2 | 332 | 15.1 | |
| 1999 | 2059 | 45.9 (21.5) | 46.8 | 15.3 | 27.3 | 361 | 17.5 | |
| 2000 | 2008 | 47.6 (21.4) | 46.3 | 20.7 | 30.2 | 368 | 18.3 | 17.3 |
| 2001 | 1906 | 47.1 (21.9) | 49.2 | 21.2 | 31.0 | 317 | 16.6 | |
| 2002 | 2196 | 46.0 (22.7) | 46.7 | 20.7 | 31.2 | 373 | 17.0 | |
| 2003 | 2173 | 45.7 (22.8) | 46.3 | 22.4 | 29.9 | 417 | 19.2 | 21.3 |
| 2004 | 2467 | 46.0 (22.2) | 46.4 | 20.8 | 30.1 | 517 | 21.0 | |
| 2005 | 2580 | 47.8 (22.2) | 48.4 | 16.5 | 32.2 | 603 | 23.4 | |
| All | 19 907 | 46.7 (21.9) | 47.5 | 18.5 | 29.9 | 3631 | 18.2 | |