In 2003, the first images confirmed the earlier study.
Researchers analyzed dust samples from the homes of 608 of the children in the earlier study.
The new study was an effort to see if the benefits continued after the earlier study ended.
As he explained to me, Intermountain's trial differed from the earlier study in any number of ways.
Many experts had been skeptical of the earlier study, whose results were less clear-cut than those released Friday.
The earlier study briefly considered propellant depots but quickly dismissed them.
The statistical study resembles a 1994 survey of abusive priests that the bishops initially encouraged and then killed, said several psychologists involved in the earlier study.
N.Y.U.'s Jerome Wakefield, who has closely compared the two studies, explained that the earlier study "seemed to have a glitch.
Nasdaq officials said the earlier study did not reflect how much their market had improved the last year, mostly because of decimals.
Consider, for instance, the cascade of insults recorded in the earlier study of middle-school gossip by Donna Eder and Janet Lynne Enke of Indiana University.
Those results aren't available yet, but when I heard about the earlier study, I decided to conduct a small experiment of my own.
