Most important, there is no comparison group that was not exposed to the Program.

The study, though positive, involved only five patients, with no comparison group.

In every study, some mothers must serve as a comparison group, and that's where the trouble begins.

Design All studies were prospective and used a comparison group.

Of those in the comparison group, 36 percent found jobs on their own.

For this comparison group, the results came out pretty much as one might expect.

But other experts noted that the Texas study did not include a comparison group.

No significant differences were found in favor of the comparison group.

Patients in the comparison group received standard advice from their doctors.

No such increase was found in members of the comparison group.