...for which the Background Paper #3 on Psychotherapy was an addendum, includes the following statement: "It has been estimated that only 10 to 20 percent...practice have been shown to be efficacious by controlled trial" (Office of Technology Assessment, Assessing the Efficacy and Safety of Medical Technologies,...

...all medical care issued by the US Congress's Office of Technology Assessment concluded by stating, "It has been estimated that only 10 to 20 percent...practice have been shown to be efficacious by controlled trial."4 There are even more limited funds available for homeopathic research, but the studies of efficacy...

...than 123 children who were not given the antibiotic. At one point, the Office of Technology Assessment estimated that "only 10 to 20 percent of all procedures...practice have been shown to be efficacious by controlled trial." Whereas most holistic or naturopathic techniques and remedies have been successfully used for...

...carried out by the Office of Technology Assessment of the US Congress reported that "only ten to twenty percent of all procedures currently used in medical practice have been shown to be efficacious in controlled trials"; in the 1990s, it is still true that over half of the techniques physicians routinely...

...reported that, in fact, the majority of therapies employed in conventional medicine were unproven: "Only 10 to 20 percent of all procedures currently...practice have been shown to be efficacious by controlled trial." A separate study published in 1991 estimated that only 15 percent of all allopathic interventions...

...(1978). the US Congress's Office of Technology Assessment reported that 'only ten to twenty per cent of all procedures currently used in medical practice have been shown to be efficacious by controlled trial' (a charge it repeated in the early 1980s). Since then, numerous academics and practitioners...

...evidence. In a publicized 1978 report, the US Office of Technology Assessment concluded, "Only 10% to 20% of all procedures currently used in medical practice have been shown to be efficacious by controlled trial." More recently, a 1999 British study found that only 40 percent of pediatric care is supported...

...of the United States Congress, came to the most startling conclusion of all. The 1978 report stated: "Only 10 to 20 percent of all procedures currently used in medical practices have been shown to be efficacious by controlled trial." In its October 1991 issue, the British...

...these assessments are not rigorous. Indeed, it is estimated that only 10 to 20 percent of technologies used in medical practice have been shown to be efficacious by controlled trials (341). Evaluation of the nonmedical effects, for example, economic and social effects, of specific...