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Operations & systems
Priority transport in multi-patient crashes: sicker, not harmed
Prehospital transport prioritization and time-varying selection bias in traffic-related multi-patient incidents: a nationwide retrospective cohort study
Critical Care · 2026-08-04 · Added 10 October 2026
Across 143,130 patients in Japanese traffic multi-patient incidents, priority (first-out) transport carried a 2.2-point adjusted risk difference for death or severe injury that peaked at 6.4 points with short scene times — a severity-selection signature rather than evidence of harm from early transport.
- Study type
- Cohort
- Design
- Nationwide retrospective cohort with doubly robust (AIPW) analysis
- Participants
- 143,130 patients from 13.8 million EMS records
- Main finding
- Priority transport associated with a 2.2-point adjusted risk difference for death/critical-severe injury (peak 6.4 points at 5-minute scene times, minimum 1.4 points at ~32 minutes), consistent with severity-dependent selection
- Caveat
- Retrospective administrative data with likely residual confounding by unmeasured injury severity
- Bottom line
- Context only
Why it matters in Australia (Medium relevance). Japan's fire-based EMS differs in staffing and trauma system design, but the triage-and-transport-priority dilemma in multi-patient incidents is the same on any Australian road.
Learning goal
Understand how transport prioritisation in multi-patient incidents reflects severity selection rather than causation.
More
- Topic: Operations & systems
- Daily scan: 10 October 2026
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