He figured that smallish trials with no control group too often yield ambiguous data.

FORBES: Magazine Article

Earlier this week, FDA staffers recommended that Xarelto should not be marketed without more data, mainly because of questions about the control group in its key study.

FORBES: Xarelto Runs The Gauntlet

Because of the data already being collected about these people, the study allowed Saczynski's group to control for heart disease, heart attack, stroke, smoking, alcohol use and other factors that could have influenced dementia.

CNN: STORY HIGHLIGHTS