41.   In one of the few controlled studies of androstenedione, recommended doses had no effect on muscle size and strength.

42.   Introducing beneficials into greenhouses has been successful, but there have not been enough controlled studies done outdoors to know how much it helps.

43.   It was described as the longest, largest controlled study of childhood asthma treatments.

44.   Kohn said that, as far as he knows, there has never been a controlled study showing long-term enhancement from a reward system.

45.   On Tuesday, Swedish researchers are reporting the first evidence from a rigorously controlled study that a beta blocker drug can slow progression of plaques in the carotid arteries.

46.   Recent carefully controlled studies have more ambiguous results than expected.

47.   Researchers also worry that providing drugs outside the carefully controlled clinical studies risks clouding up the investigation, and might ultimately slow approval.

48.   Several controlled studies have found that cognitive-behavioral therapy is the most effective treatment for bulimia, compared with other kinds of psychotherapy or drugs.

49.   Such cases warrant immediate large-scale controlled studies, he says.

50.   The application cited several patients who were being followed in another component of the project and said most would be interested in participating in the controlled study.