title: Understanding tests of the association of categorical variables: the Pearson chi-square test and Fisher's exact test.
authors.affiliation: Department of Anesthesiology, University of Wisconsin Hospital and Clinics, Madison, Wisconsin.
authors.forename: Aaron S
authors.initials: AS
authors.lastname: Hess
authors.affiliation: Department of Laboratory Medicine, University of Washington, Seattle, Washington.
authors.forename: John R
authors.identifier: 0000-0001-8596-4420
authors.initials: JR
authors.lastname: Hess
mesh_terms: D016009:Chi-Square Distribution; D003627:Data Interpretation, Statistical; D005260:Female; D006801:Humans; D016014:Linear Models; D008962:Models, Theoretical