Overview
Respiratory Illness
EVENT, INFLUENZA
For a participant to be included in the ILI analysis population, they must have either tested positive for influenza as part of the testing regime in the FluStudy2020 or Home Testing of Respiratory Illness (HTRI) study, met the FluStudy2020 study–defined ILI symptom criteria, or received an antiviral prescription from a health care professional for their ILI event. The FluStudy2020 and HTRI studies were designed independently by different sponsors, but both were performed concurrently by Evidation Health. Both studies were conducted in the United States between December 2019 and October 2020. Given the similarity in study designs (Study design overview and flow diagram for preparing analysis data sets. (A) Study design overview for the FluStudy2020 and Home Testing of Respiratory Illness (HTRI) studies. During the enrollment period, the participants completed a screener survey and a baseline survey and connected their commercial wearable sensor (Fitbit) to the Evidation platform. The participants in the HTRI study were issued with an influenza diagnostic kit during enrollment to be used as instructed based on symptoms reported in the daily survey. Once enrolled, participants completed daily surveys for 120 days, in addition to monthly and biweekly surveys. Wearable sensor data were collected for 150 and 120 days in the FluStudy2020 and HTRI studies, respectively. The participants completed the 