In addition, epidemiologic studies may be classified as descriptive or analytic, depending on whether they are intended to characterize disease or test conclusions drawn from descriptive surveys or laboratory observations.
Information from epidemiologic studies frequently is used to plan new health services and to evaluate the overall health status of a given population.
Another commonly used model, the epidemiologic triad (or epidemiologic triangle), views the occurrence of disease as the balance of host, agent, and environment factors.
The epidemiologic transition is that process by which the pattern of mortality and disease is transformed from one of high mortality among infants and children and episodic famine and epidemic affecting all age groups to one of degenerative and man-made diseases (such as those attributed to smoking) affecting principally the elderly.
Decades of research have produced molecular markers that serve as tools for health-related assessments, epidemiologic studies, and the diagnosis of disease, ranging from cancer to cardiovascular, neurological, and inflammatory diseases.
Some prospective epidemiologic studies attempt to overcome this difficulty by following subjects for a number of years.
In most countries of the world, public-health authorities regularly gather epidemiologic data on specific diseases and mortality rates in their populaces.
It is generally believed that the epidemiologic transitions prior to the 20th century (i.e., those in today's industrialized countries) were closely associated with rising standards of living, nutrition, and sanitation.
To illustrate the epidemiologic triad, a case of lung cancer may be considered.
"It's going to take a lot of epidemiologic investigation," he said.
It was complemented by her contribution to the 1957 book The Student Physician that described innovative changes to the Comprehensive Care and Teaching Program for fourth-year medical students at Weill Cornell, such as introducing a public health focus on more advanced epidemiologic studies of diseases important to clinicians.
