78d97f2a__Effective_Health_Care_Program_gth_of_evidence_rating_domains_Domain_Name
[Domain Type] Optional Occasionally, in an observational study, plausible confounding would work in the direction opposite that of the observed effect. Had these confounders not been present, the observed effect would have been even larger that the one observed. [Domain Score and Application] This domain should be considered when plausible confounding exists that would decrease the observed effect. Score as one of two levels: Present: Confounding factors that would decrease the observed effect may be present and have not been controlled for. Absent: Confounding factors that would decrease the observed effect are not likely to be present or have been controlled for. [Domain Name] 
Plausible confounding that would decrease observed effect
Radiotherapy Treatments for Head and Neck Cancer: Update - Research Protocol | AHRQ Effective Health Care Program
Domain Name