Structure: candidate variables
| Hospital name |
| Consultant cardiac surgeons |
| Junior surgical staff |
| Consultant interventional cardiologists |
| Junior medical staff |
| Number of operating theatres |
| Number of catheter laboratories |
| Level of equipment available |
| Level of specialist services available |
| Annual number of open heart procedures |
| Annual number of diagnostic catheterisations |
| Annual number of interventional catheterisations |