Hospitals involved in the data collection
| Allenmore | Overlake |
| Central Washington | PeaceHealth St John |
| Evergreen | Providence Everett |
| Good Samaritan | Sacred Heart |
| Grays Harbor | Samaritan Healthcare |
| Group Health Eastside | Skagit Valley |
| Harborview | Stevens Healthcare |
| Highline | Sunnyside |
| Holy Family | Swedish – First Hill |
| Island Hospital | Tacoma General |
| Jefferson General | United General |
| Kadlec | University of Washington |
| Kittitas Valley | Valley Medical Center |
| Legacy Good Sam (Portland) | Virginia Mason |
| Morton General | Wenatchee Valley |
| Mt Carmel | Whidbey General |
| Northwest | Yakima Regional & Heart Medical Center |
| Olympic | Yakima Valley |