National Health Service regions and classification of centre
| Region | Participating hospital units | Teaching hospitals | District general hospitals | Private hospitals | Paediatric units |
|---|---|---|---|---|---|
| *Three NET and one WM hospital failed to provide adequate data for inclusion. | |||||
| West Midlands (WM) | 31 | 5 | 18 | 7 | 1 |
| East Anglia (EA) | 15 | 1 | 11 | 3 | 0 |
| North East Thames (NET) | 17 | 4 | 10 | 3 | 0 |
| Other | 5 | 1 | 4 | ||
| Total* | 68 | 10 | 39 | 14 | 5 |