why is overmatching important for epidemiological research what is overmatching in epidemiology what is overmatching what is the difference between a matching observation and a confounding observation? what is overmatch bias what is overmatching in epidemiology what is overmatching in epidemiology how can overmatching cause bias what kind of bias is caused by overmatching what is over match in epidemiology why overmatching results in bias is overmatching confounded why is match bias important what is overmatch bias and confounding variables what is overmatching bias when overmatching bias occurs why is overmatching bias is matching bias? define matching in epidemiology what is the difference between an overmatch and a confounder study?