Risk of Bias	Author’s Judgment Low Risk Unclear High Risk	Support for Judgment
Selection bias		Only Enterobacteriaceae
Bias in definition and measurement		AMS not well-defined
Outcome measurement bias		Hospice discharge considered dead
Handling of missing data		Reported missing data, but did not explain how they responded to this
Confounding		Young patients and large Afro-American population
Bias of statistics or presentation of result