A study in which a particular outcome, such as death from a heart attack, is compared in groups of people who are alike in most ways but differ by a certain characteristic, such as smoking. See also: Cohort.

A research study that compares a particular outcome (such as lung cancer) in groups of individuals who are alike in many ways but differ by a certain characteristic (for example, female nurses who smo [..]

concurrent study follow-up study incidence study longitudinal study prospective study Analytic study of epidemiological study in which subsets of a defined population can be identified who are, have b [..]

A study that follows a large group of people (a cohort) over time.

A study in which a group of people with a past exposure to chemicals or other risk factors are followed over time and their disease experience compared to that of a group of people without the exposur [..]

See Prospective cohort study

A type of epidemiological study in which a particular outcome, such as a medical condition, is compared according to a putative factor (a factor suspected to influence the chances of acquiring the medical condition) in a group of individuals who are linked in some way (the cohort). In a prospective cohort study the group of individuals is followed [..]

This is a investigation in which a cohort of individuals who do not have evidence of an outcome of interest but who are exposed to the putative cause are compared with a concurrent cohort who are also free of the outcome but not exposed to the putative cause. Both cohorts are then followed forward in time to compare the incidence of the outcome of [..]

An observational study in which a sample of participants is followed over time in an effort to determine the factors leading to different outcomes

A prospective, observational study of subjects that may develop a specific condition. Subjects without the condition at baseline are classified based on exposure to factors that may influence occurrence of the condition. Incidence of the condition is assessed after an appropriate follow-up time (typically long-term). The incidence of the condition [..]

An epidemiological study in which a large number of individuals in a population are observed over a period of time. Subgroups of individuals, who are exposed to something, are compared to other subgroups with a different level of exposure to see if there is a difference in the health outcomes of interest.

In analytical epidemiology, a study in which a population exposed to a presumed cause of a disease is followed over a set period of time to monitor the appearance of the disease. A control group is al [..]

The analytic method of epidemiologic study in which subsets of a defined population can be identified who are, have been, or in the future may be exposed or not exposed, or exposed in different degrees, to a factor or factors hypothesized to influence the probability of occurrence of a given disease or other outcome. The main feature of cohort stud [..]

This study identifies a group of people and follows them over a period of time to see how their exposures affect their outcomes. This type of study is normally used to look at the effect of suspected risk factors that cannot be controlled experimentally, for example the effect of smoking on lung cancer.

An observational study in which outcomes in a group of patients that received an intervention are compared with outcomes in a similar group (the cohort) either contemporary or historical, of patients [..]

Involves identification of two groups (cohorts) of patients, one which received the exposure of interest, and one which did not, and following these cohorts forward for the outcome of interest.

a study that follows a large group of people over a long period of time, often 10 years or more. In cohort studies, dietary information is gathered before disease occurs, rather than relying on recall [..]

Studies in which subsets of a defined Population are identified. These groups may or may not be exposed to factors hypothesized to influence the Probability of the occurrence of a particular Disease o [..]

A group of individuals who share a common trait, such as birth year. In medicine, a cohort is a group that is part of a clinical trial or study and is observed over a period of time.

An epidemiological study design in which a group of individuals are followed over time to look at their disease risk factors. Individuals who develop disease are then compared to healthy individuals w [..]

A type of observational analytic study. Enrollment into the study is based on exposure characteristics or membership in a group. Disease, death, or other health-related outcomes are then ascertained a [..]

A cohort study is a study in which researchers compare two groups over a period of time. At the start of the study, one of the groups has a particular condition or receives a particular treatment, and [..]

is one of the three basic analytical observational study designs. A cohort study starts by defining groups by the study factor (e.g. exposure present or absent) and then follows-up these exposure groups to detect the outcome (e.g. disease present or absent). A cohort study has a forward directionality. A cohort study is able to estimate relative ri [..]

A study in which a clearly identified group is characterized by exposure and is followed for the outcome.

A observational study that begins with the gathering of two matched groups (the cohorts), one which has been exposed to a prognostic factor, risk factor or intervention and one which has not ( or it i [..]

The study of subsets of a defined population. In an epidemiological study, some subjects might be exposed, or exposed in different degrees, to a factor (e.g. an environmental contaminant) hypothesized to influence a given outcome (e.g. a disease). Usually large numbers of subjects are observed over a long period (commonly years),  which permits a c [..]

A study to determine risk factors for a disease by tracking a group of healthy people who share a similar characteristic, such as their type of work, and seeing whether they develop the disease in que [..]