Design
A cohort of nurses aged 30 to 55 were initially surveyed in 1976 and biennially thereafter. A second cohort of nurses were enrolled in 1989.
Over time additional questions have been added, most notably the dietary assessment added in 1980. Deaths, usually reported by kin or by postal authorities, were followed up. Where possible and permitted, in cases suggestive of cardiovascular disease/coronary heart disease the followup went beyond death certificates to gather available documentation from autopsy reports and other records. Mortality followup is better than 98 percent.
In 1996, over 16,000 children of women in the second Nurses' Health Study cohort were enrolled in their own follow-up study called the Growing Up Today Study, or GUTS.
Read more about this topic: Nurses' Health Study
Famous quotes containing the word design:
“Delay always breeds danger; and to protract a great design is often to ruin it.”
—Miguel De Cervantes (1547–1616)
“Teaching is the perpetual end and office of all things. Teaching, instruction is the main design that shines through the sky and earth.”
—Ralph Waldo Emerson (1803–1882)
“You can make as good a design out of an American turkey as a Japanese out of his native stork.”
—For the State of Illinois, U.S. public relief program (1935-1943)