The study, by Yusuke Tsugawa and colleagues at the Harvard T. H. Chan School of Public Health, Harvard Medical School, and other institutions, examined the record of a large random sample of Medicare patients, 65 years or older, who were hospitalized from January 2011 to December 2014. (fortune.com)
They found that one in five of a large random sample of male prisoners serving sentences in England and Wales used «hard» drugs — heroin, amphetamines or cocaine. (newscientist.com)
The project team administered surveys to a large random sample of American adults nation - wide after three years of survey development. (sciencedaily.com)