Two studies were randomized controlled and one was quasi-randomized controlled (patients who were admitted to an odd-numbered ICU cubicle received continuous control of P cuff, and those admitted to an even-numbered ICU cubicle received routine care).
All the included studies were randomized and controlled (parallel arm or crossover).
Because most of these studies were randomized controlled trials the "gold standard" of medical evidence they tended to have a significant impact on clinical practice, and led to the spread of treatments such as hormone replacement therapy for menopausal women and daily low-dose aspirin to prevent heart attacks and strokes.
All the studies were randomized and controlled: they compared people who did tai chi with those who either did another type of exercise or were waiting to join a tai chi class.
The three studies were randomized, controlled, non-blinded studies.
Eligible studies were randomized trials comparing HPV-based to cytology-based screening strategies, with disease status determined by colposcopy/biopsy for participants with positive results.
All studies were randomized, controlled, double-blind studies except that of Abroug et al. [38] which was a randomized, controlled, open-label study including critically ill patients.
All of these studies were randomized, double-blind and placebo controlled.
All of these studies were randomized, double-blind, and placebo-controlled.
Further, all of the above studies were randomized, double-blind, and placebo controlled.
All studies were randomized and all but one [17] were described as double-blind.
