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Phase I: number of patients assigned to each acuity level by triage method: one-two-triage (OTT), Emergency Severity Index (ESI) and physician-defined acuity (PDA). The group of patients enrolled in phase I showed a similar distribution across acuity levels when triaged by OTT, ESI and PDA. OTT characterised slightly more patients as high acuity and PDA characterised slightly more patients as the lowest acuity.
