And when five studies concluded that the Air Force doesn't need them?
Over time, most studies concluded that the magic number of direct reports was between five and seven.
But an earlier analysis, of fewer but similar studies, concluded that the evidence was not convincing.
However, a recent systematic review of data from 231 studies concluded that the test may have limited clinical value.
A 1996 analysis of 54 studies concluded that the pill did seem to raise the breast cancer risk, perhaps by about one-quarter.
But several studies concluded that the ritual of the daily injection and the instant gratification of quick weight loss helped motivate people to stay on the diet.
Both types of studies concluded that the IUCN criteria can not only identify species that would be extinct without conservation effort, but do so with substantial warning time.
You can buy oral probiotics, but a review last year of the small number of studies concluded that the data was "deficient".
But a critical review of several natural-experiment studies concluded that the best available estimates of this sensitivity range from 0.12 to 0.40.
Many early climate studies concluded that the harm to agriculture in low-latitude countries by higher temperatures would be largely offset by increased grain production in higher latitudes.
Previous studies concluded that the members of the organization, the Association of National Advertisers, had been uncertain about the potential benefits of the Web as a medium for advertising and commerce.
