Characteristics of eligible clusters
| Catchment area (approx.) | Number of beds | Unique admissions in 2016* | |
| Capital region of Denmark | |||
| Herlev-Gentofte Hospital two units | 480 000 | 949 | 41 420 |
| Nordsjaellands Hospital two units | 378 000 | 552 | 34 159 |
| Bispebjerg Hospital one unit | 460 000 | 456 | 13 013 |
| Glostrup Hospital one unit (Medical ward) | 139 000 | 83 | 6598 |
| Amager-Hvidovre Hospital two units | 532 000 | 698 | 26 466 |
| Region Zealand | 836,000† | ||
| Zealand University Hospital two units | 629 | 34 125 | |
| Slagelse Hospital one unit | – | 327 | 17 999 |
| Holbaek Hospital one unit | – | 338 | 16 125 |
*Number of unique admissions is based on the wards that are participating in the study.
†The catchment area in Region Zealand is not defined for each hospital.