Early and modern studies also differ because the treatment protocol has changed.

The studies differed in the way they were conducted but added to existing evidence of these dangers.

But studies over the years have differed on whether levels of these compounds in tap water adversely affect health.

This study differed from ours in that a different stimulus was used.

He said studies have differed on whether the higher speeds had led to an increase in deaths and injuries.

The proposed study differs from the one reported on today by the Dartmouth researchers.

Enumerative and analytic studies differ by where the action is taken.

However, various scientific studies differ on the size of each component.

But studies differ sharply on just how well smaller classes work.

The study differed from prior research that there is more balance in familiarity of the dominant language.