Yearly changes in empyema incidence, management and mortality
| Year# | ||||||||||
| 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | |
| Total empyema count | ||||||||||
| All ages | 4447 | 4573 | 5002 | 4812 | 5087 | 5314 | 5697 | 6415 | 6811 | 7268 |
| <18 years | 510 | 573 | 591 | 423 | 438 | 336 | 372 | 448 | 393 | 376 |
| 18–44 years | 794 | 808 | 898 | 699 | 806 | 830 | 855 | 992 | 953 | 1082 |
| 45–59 years | 931 | 907 | 1019 | 1048 | 1021 | 1089 | 1170 | 1338 | 1472 | 1523 |
| ≥60 years | 2212 | 2285 | 2494 | 2642 | 2822 | 3059 | 3300 | 3637 | 3996 | 4287 |
| Empyema per 100 000 hospital admissions | 6.4 | 6.3 | 6.7 | 6.4 | 6.7 | 6.8 | 7.0 | 7.7 | 8.0 | 8.4 |
| Mortality % of total count of empyema | 13.7 | 14.0 | 14.0 | 13.5 | 13.7 | 14.8 | 15.2 | 13.2 | 14.2 | 12.7 |
| Surgery % of total count of empyema | 15.1 | 14.4 | 14.3 | 14.0 | 14.1 | 13.8 | 14.2 | 12.8 | 13.2 | 14.5 |
| Hospital LOS for empyema cases | 14.2 (6.6–27.58) | 14.5 (6.90–27.0) | 14.6 (6.8–27.07) | 14.1 (6.6–26.9) | 14.3 (6.4–27.0) | 14.5 (6.6–27.4) | 14.8 (6.7–27.4) | 14.23 (6.3–26.6) | 14.2 (6.4–26.6) | 13.6 (6.4–25.0) |
| Ratio of winter versus rest of year | 1.4 | 1.1 | 1.5 | 1.1 | 1.3 | 1.1 | 1.4 | 1.1 | 1.3 | 1.3 |
Data are presented as n or median (interquartile range). LOS: length of stay. #: years start April 1.