Table 3.

Predictor Variables Included in Each Influenza Risk Score or Classification and Regression Tree (CART) Model

Study, Year	Cough	Fever	Chills or Sweats	Myalgia	Acute Onset	Coryza	Sore Throat	Age	Headache	Fatigue or malaise	Sneezing	Flu in community	Close Contact	Sex	Sinus Problems
Afonso, 2012	×	×	×		×
Afonso, 2012		×	×
Afonso, 2012		×		×
Anderson, 2018	×		×	×		×		×
Dugas, 2019	×	×							×
Ebell, 2012 (FluScore)	×	×	×	×	×
Govaert, 1998	×	×	×	×	×		×		×	×
Ranjan, 2012	×	×				×	×				×	×	×
Vuichard-Gysin, 2019 (children)	×	×	×			×								×
Vuichard-Gysin, 2019 (children)	×	×	×					×
Vuichard-Gysin, 2019 (adults)	×		×	×			×								×
Vuichard-Gysin, 2019 (adults)	×		×	×
Woolpert, 2012	×	×		×	×
Zimmerman, 2016	×	×								×
Number of models:	12	11	9	7	4	3	3	2	2	2	1	1	1	1	1