Outcomes
DISEASE MODEL, SECONDARY, SARS-COV-2 INFECTION
The primary outcome was the proportion of newly diagnosed SARS-CoV-2–positive patients among all adults visiting the 18 EDs during the study period.Patients who tested positive and whose SARS-CoV-2–positive status was not already known were considered positive. Unscreened patients or those whose test result was negative, indeterminate, or positive with a known status <3 months prior were classified as nonpositive.The secondary outcomes were as follows: (a) implementation of ED screening for asymptomatic/paucisymptomatic patients, including the proportion of patients who completed the questionnaire; the proportion of screening tests that were offered, accepted, and performed; and patient characteristics reported in the DEPIST-COVID questionnaire; (b) the proportion of new SARS-CoV-2 infections diagnosed through ED screening for asymptomatic/paucisymptomatic patients and patient characteristics, and the proportion of patients who tested positive for other respiratory viruses; (c) the proportions of new SARS-CoV-2 infections diagnosed through ED screening for asymptomatic/paucisymptomatic patients versus the proportions of positive tests through community screening for asymptomatic adults in the geographical departments of the Paris metropolitan region during the same period, overall and per ED; the proportion of new SARS-CoV-2 infections diagnosed through ED screening for all patients versus the proportion of positive tests through community screening for all adults in the geographical departments of the Paris metropolitan region during the same period; and (d) the proportions of new SARS-CoV-2 infections diagnosed through ED screening versus the incidence rate in the Paris metropolitan region estimated from an age-stratified disease model for SARS-CoV-2 transmission.