Table 1.

Inclusion and exclusion criteria of screening strategy.

PICOa/other element	Inclusion criteria	Exclusion criteria
Population	Undifferentiated population seeking emergency services (including COVID-19 assessments).	Specialty-specific population (eg, stroke, heart disease).
Concept	Triage of emergency telemedicine services enhanced by any MLb method that includes only data collected remotely.	Only conventional triage methods used or ML models that include predictors derived from physical assessments (eg, vital signs). Internet of medical things devices requiring physical or in-person assessments were excluded (eg, home blood pressure equipment).
Context	Provision of emergency telemedicine services, including web-based symptom checkers, clinician-staffed telephone line, or emergency medical dispatch.	Provision of in-person emergency care.
Evidence type	Primary research studies.	Literature reviews, protocols, guidelines, letters, gray literature, and qualitative studies excluded.
Language	Studies published in English.	Studies in languages beyond English.
Date	Published before February 24, 2023.	Published on or after February 24, 2023.

^aPICO: Population, Intervention, Comparison, and Outcome.

^bML: machine learning.