Author | Year | Location | Number of departments | Study Population | Total patients | Attendance categories | Highest category |
---|---|---|---|---|---|---|---|
Emergency department | |||||||
 Van der Linden [34] | 2014 | Netherlands | 2 | All | 51,272 | 14 | 34 |
 Billings [48] | 2013 | USA | Multiple | Medicaid, ages 18–62 | 212,259 | 7 | 15+ |
 Capp [47] | 2013 | USA | 1 + satellites | Medicaid, all ages | 13,959 | 4 | 18+ |
 Doran [49] | 2013 | USA | Network | Veterans, Veterans Health Administration insurance | 930,712 | 5 | 26+ |
 Liu [43] | 2013 | USA | 1 | All | 65,201 | 4 | 19+ |
 Martin [42] | 2013 | USA | 1 | All | 95,170 | 5 | 20+ |
 Minassian | 2013 | USA | 2 | All | 39,249 | 20 | 41+ |
 Doupe [45] | 2012 | Canada | 6 | Age 18+ | 105,688 | 12 | 18+ |
 Paul [41] | 2010 | Singapore | 1 | All — if has not attended the ED in past 12 months | 82,172 | 6 | 10+ |
 Moore [19] | 2009 | UK | 1 | All | 82,812 | 6 | 10+ |
 Locker [33] | 2007 | UK | 1 | All | 75,141 | 16 | 16+ |
 Jelinek [44] | 2008 | Australia | 9 | Age 15+ | 186,069 | 6 | 40+ |
 Ruger [40] | 2004 | USA | 1 | All | 50,850 | 5 | 21+ |
 Riggs [39] | 2003 | USA | 1 | All | 22,492 | 17 | 35 |
 Murphy [38] | 1999 | Ireland | 1 | All | 34,908 | 13 | 21+ |
Primary care out of hours | |||||||
 Buja [51] | 2015 | Italy | 1 | All | 17,657 | 11 | 11+ |
 Den Boer-Wolters [50] | 2010 | Netherlands | 1 | All | 44,953 | 10 | 10+ |