Table 1 Inclusion and exclusion criteria

Direct conveyance from scene to a hospital in included trauma network

Conveyed to non-participating hospital

Conveyed by participating ambulance service

Conveyed by non-participating ambulance service

Presented during 4 months study period

Not conveyed to hospital

Any age

Non-ambulance presentation

Presented with non-trivial injury to EMS (selected WI code, major trauma pre-alert, trauma-specific intervention)

Death in field

Major trauma triage tool would plausibly be used

Secondary transfer

Presentation out of study dates

Trivial injury presentation

Non-acute injury presentation (>72 hours)

Medical presentation

Isolated hypoxic injury (hanging, drowning)

Isolated burns

Triage tool exclusions: Traumatic cardiac arrest, Unstable ABC/divert to TU