A student wanted to conduct a casecontrol stud'vr on excessive coffee consumption and insomnia. Students who consumed more than 36 ounces of coffee in a dav {on average} were considered exposed. while students who did not meet this level of consumption were considered unexposed. Students who had signicant trouble sleeping at least once a week were considered to have insomnia. and students who did not have trouble sleeping at least once a week were considered to not have insomnia. Coffee consumption was assessed retrospectively. The following 2x2 table was created: What measure of association should be calculated for this scenario