Blinding
BLIND
Although the caregivers could not be blinded to study intervention, they were blinded to the study hypothesis. The investigators, study managers (J.S. and M.R.), ED staff, research assistants performing telephone follow-ups, and the analyst were blinded. To blind the ED staff, the parents were instructed not to reveal the assigned device to the ED team. To blind the analyst, the assigned allocation in the database was labeled by an unidentified group 1 or group 2 designation.