In many cases, nursing home officials said, they do not know to which plans their patients have been assigned.

In the study, patients were randomly assigned to four groups.

Fifty patients were randomly assigned to one of two groups.

Instead, patients will be assigned to a team of caseworkers.

"Pay attention to how many patients your nurse is assigned to," he writes.

At this point, patients are randomly assigned to groups taking the new therapy or the old one.

A patient assigned to him minutes earlier had died and he was needed for the death pronouncement.

Each patient is assigned an individual tutor who continues through high school.

The other patients were assigned to "conservative treatment," which included pain management and physical therapy.

The most important weakness is the fact that the patients were not randomly assigned to the two treatment groups.