Two pediatric emergency physicians and a pediatric nurse practitioner (PNP) who were blinded to the initial nursing triage assessment conducted a written chart review. A chart review was conducted on all unstable patients and on a random subset of stable patients as identified by the nurse at triage using the PAT. This subset consisted of the first 25 stable patients each month of the study duration. A list of eligible patients was generated by medical record number, date of birth, and date of visit. Investigators reviewed the chart for PAT-specific criteria and observations, thus reconstructing the physician’s PAT at the time of presentation.