• July 7, 2022

What Is Source Population In Case Control Study?

What is source population in case control study? The source population is the population that gives rise to the cases included in the study. If a cohort study were undertaken, we would define the exposed and unexposed cohorts (or several cohorts) and from these populations obtain denominators for the incidence rates or risks that would be calculated for each cohort.

What is a reference population in epidemiology?

1. a subset of a target population that serves as a standard against which research findings are evaluated. For example, consider an investigator examining the effectiveness of eating disorder prevention programs at 4-year colleges and universities in the United States.

What is a study population in research?

Study population: The group of individuals in a study. In a clinical trial, the participants make up the study population. The study population might, for example, consist of all children under 2 years of age in a community.

What is the target population example?

The target population is the entire population, or group, that a researcher is interested in researching and analysing. Examples of a target population are a company's customer base, the population of particular country, the students at a particular university or tenants of a housing association.

What sources can be used for controls in a case-control study?

Methods of Control Sampling

  • Survivor sampling: This is the most common method.
  • Case-base sampling (also known as "case-cohort" sampling): Controls are selected from the population at risk at the beginning of the follow-up period in the cohort study within which the case-control study was nested.

  • Related advise for What Is Source Population In Case Control Study?


    What is an example of a case-control study?

    For example, in a case-control study of the association between smoking and lung cancer the inclusion of controls being treated for a condition related to smoking (e.g. chronic bronchitis) may result in an underestimate of the strength of the association between exposure (smoking) and outcome.


    What is a source population example?

    Generally speaking, the source population is the population from which your study subjects are drawn. In your example, that would be the 100,000 screened individuals under a specific assumption. Namely, that the screened population is an entire population.


    What is source population and study population?

    A source population is a subset of a target population: it is a smaller population within a larger target population from which a sample is drawn. A study population is common term for a sample drawn from a source population: this is a confusing term because a “study population” is not a population, it's a sample.


    What does target population mean?

    The target population is the group of individuals that the intervention intends to conduct research in and draw conclusions from. In cost-effectiveness analysis, characteristics of the target population and any subgroups should be described clearly.


    What is population in qualitative research?

    In research terminology the Population can be explain as a comprehensive group of individuals, institutions, objects and so forth with have a common characteristics that are the interest of a researcher. Any value which is identified or measured from the characteristics of entire population can be called as Parameter.


    What is population in research methods?

    A research population is generally a large collection of individuals or objects that is the main focus of a scientific query. A research population is also known as a well-defined collection of individuals or objects known to have similar characteristics.


    What are examples of populations?

    Population is the number of people or animals in a particular place. An example of population is over eight million people living in New York City.


    What is accessible population?

    Accessible population. the portion of the population to which the researcher has reasonable access; may be a subset of the target population. May be limited to region, state, city, county, or institution.


    What is the difference between target population and accessible population?

    The target population usually has varying characteristics and it is also known as the theoretical population. The accessible population is the population in research to which the researchers can apply their conclusions.


    How do population differs with sample?

    A population is the entire group that you want to draw conclusions about. A sample is the specific group that you will collect data from. The size of the sample is always less than the total size of the population. In research, a population doesn't always refer to people.


    What is density sampling?

    A method of selecting controls in a Case-control study in which cases are sampled only from incident cases over a specific time period and controls are sampled and interviewed throughout that period (rather than simply at one point in time, such as the end of the period).


    What are the primary sources of bias in case-control studies?

    Main sources of potential bias were a non-concurrent selection of controls with respect to cases, the use of control diagnoses possibly caused by pesticide exposure in hospital-based studies, and non-participation of selected eligible subjects.


    How do you create a cohort study?

  • Identify the study subjects; i.e. the cohort population.
  • Obtain baseline data on the exposure; measure the exposure at the start.
  • Select a sub-classification of the cohort—the unexposed control cohort—to be the comparison group.
  • Follow up; measure the outcomes using records, interviews or examinations.

  • How do you distinguish between a case-control and a cohort study?

    Whereas the cohort study is concerned with frequency of disease in exposed and non-exposed individuals, the case-control study is concerned with the frequency and amount of exposure in subjects with a specific disease (cases) and people without the disease (controls).


    What is the difference between matched and unmatched case-control study?

    Abstract. Multiple control groups in case-control studies are used to control for different sources of confounding. For example, cases can be contrasted with matched controls to adjust for multiple genetic or unknown lifestyle factors and simultaneously contrasted with an unmatched population-based control group.


    What is the difference between cross sectional and case-control study?

    Cross sectional studies are used to determine prevalence. They are relatively quick and easy but do not permit distinction between cause and effect. Case controlled studies compare groups retrospectively. They seek to identify possible predictors of outcome and are useful for studying rare diseases or outcomes.


    What is a source population ecology?

    Quick Reference. An ecological model that is used to describe population changes in two habitats, both occupied by the same species. One habitat is of high quality and allows a population to increase (i.e. births + immigration > deaths + emigration), leading to a surplus. This is the source.


    What is base population?

    The base population refers to the number of people in a given area (e.g. a nation, province, city, etc) to which a specific vital rate applies, that is, the denominator of the crude birth rate or death rate; that population determined by a census.


    What is a sink population?

    Sink populations exist in low quality habitat patches that would not be able to support a population in isolation, and without the contribution of individuals from a source population, would become extinct.


    How do you define population study?

    Study population: The group of individuals in a study. In a clinical trial, the participants make up the study population. The study population might, for example, consist of all children under 2 years of age in a community.


    What is switchover in epidemiology?

    ♦ A switchover bias occurs if the target parameter is on the opposite side of the null value from the parameter actually being estimated in one's study.


    What is population in sampling?

    A population is a complete set of people with a specialized set of characteristics, and a sample is a subset of the population. The study population is the subset of the target population available for study (e.g. schizophrenics in the researcher's town). The study sample is the sample chosen from the study population.


    What is a population PDF?

    A population is defined as a group of individuals of the same species living and interbreeding within. a given area. Members of a population often rely on the same resources, are subject to similar.


    How do you calculate target population?

    You estimate the target population by multiplying the total population by the percentage in a particular category; for example in Table 5.1: Expressing a percentage as a decimal number is easy, e.g. 90% is the same as 0.9; 23% is the same as 0.23, and 4% is the same as 0.04.


    What are the two types of sampling techniques?

    There are two types of sampling methods:

  • Probability sampling involves random selection, allowing you to make strong statistical inferences about the whole group.
  • Non-probability sampling involves non-random selection based on convenience or other criteria, allowing you to easily collect data.

  • What is population in quantitative studies?

    A population consists of all the objects or events of a certain type about which researchers seek knowledge or information. From their observations about the sample, researchers make generalizations about the population from which the sample was chosen.


    What is population in Research PDF?

    A population refers to any collection of specified group of human beings or of non-human entities such as objects, educational institutions, time units, geographical areas, prices of wheat or salaries drawn by individuals.


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