Epidemiological Study Types Quiz

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Questions and Answers

What are the types of observational studies?

  • Experimental studies
  • Case report (correct)
  • Descriptive studies (correct)
  • Analytical studies (correct)

Which of the following are examples of analytical studies?

  • Case-control studies (correct)
  • Cohort studies (correct)
  • Cross-sectional studies (correct)
  • All of the above

What are the types of experimental studies?

  • Preventive trials (correct)
  • Clinical trials (correct)
  • Population trials (correct)
  • All of the above

What factors are considered in a descriptive study?

<p>Age, sex, race, geographical distribution of disease, secular trend, seasonal variation</p> Signup and view all the answers

What is a case report?

<p>A detailed report of symptoms, signs, diagnosis, and treatment for an individual patient.</p> Signup and view all the answers

What is a cross-sectional study?

<p>A study that examines a snapshot of a population at a specific point in time.</p> Signup and view all the answers

What are the advantages of cross-sectional studies?

<p>Measure population sample characteristics (A), Determine disease prevalence (B), Can study multiple risk factors and multiple diseases at the same time (C)</p> Signup and view all the answers

What is a case-control study?

<p>A retrospective study that compares individuals who have a disease (cases) to individuals who do not have the disease (controls)</p> Signup and view all the answers

What are the advantages of case-control studies?

<p>The number of subjects can be small (A), Results can be obtained relatively quickly. (B), Relatively low cost (C)</p> Signup and view all the answers

Flashcards

Case Report

A detailed report about a single patient's illness, including their symptoms, diagnosis, and treatment.

Case Series

A study examining the medical records of multiple patients with a shared characteristic, such as a specific treatment.

Descriptive Study

A type of epidemiological study that describes the characteristics of a disease, such as its distribution in a population.

Analytic Study

A study that investigates the relationship between a factor (exposure) and a disease or health outcome.

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Case-Control Study

A study that compares people with a disease to people without the disease to identify factors that may have contributed to the disease.

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Cohort Study

A type of analytic study that follows groups of people over time to see who develops a disease, and how.

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Experimental Study

Studies designed to test the effect of an intervention, such as a new treatment or preventive measure.

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Prevalence Study

A cross-sectional study that measures the prevalence of a disease or condition in a population at a specific point in time.

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Disease Prevalence

The proportion of people in a population who have a specific disease at a particular time.

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Rare or Highly Fatal Disease

The characteristic of a disease that makes it difficult to study using cross-sectional studies, particularly if the disease has a short duration or is fatal.

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Cross-Sectional Study

A study that collects data from a population at a single point in time to assess disease status and risk factors.

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Small Subject Number (Case-Control)

One of the key advantages of case-control studies: they require a small number of participants.

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Fast Results (Case-Control)

Another advantage of case-control studies: they produce results relatively quickly.

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Low Cost (Case-Control)

A third advantage of case-control studies: they are usually more cost-effective than other study types.

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Bias (Case-Control)

A potential disadvantage of case-control studies: systematic errors or flaws in the study design.

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Odds Ratio

A statistical measure often used in case-control studies to estimate the association between an exposure and a disease.

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Incidence Rate

A measure used in epidemiological studies to describe the frequency or rate of occurrence of a disease or other health outcome.

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Retrospective Cohort Studies

A type of observational study that follows groups of people over time to assess health outcomes based on past exposures.

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Prospective Cohort Studies

A type of observational study that follows groups of people forward in time to assess health outcomes based on current or future exposures.

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Study Notes

Epidemiological Study Types

  • Observational studies: Investigators observe subjects but do not intervene
  • Descriptive studies: Describe disease patterns in a population
    • Case report: Detailed report of symptoms, signs, diagnosis, and treatment of an individual patient
    • Case series: Research study tracking subjects with a known exposure, examining medical records for exposure and outcome
    • Person: Age, sex, race
    • Place: Geographic distribution of disease
    • Time: Secular trend, seasonal variation
  • Analytic studies: Determine associations between exposures and diseases
    • Case-control studies: Compare individuals with a disease (cases) to individuals without the disease (controls)
    • Cohort studies: Follow a group of individuals over time to observe disease development
    • Experimental studies: Investigators intervene to test a hypothesis
      • Preventive trials
      • Clinical trials
      • Population trials

Cross-Sectional Study

  • Also known as prevalence study
  • Not suitable for studying rare or highly fatal diseases with short durations of expression (acute diseases)
  • Advantages:
    • Measures population sample characteristics
    • Determines disease prevalence
    • Studies multiple risk factors and multiple diseases simultaneously

Case-Control Study

  • Retrospectively compares individuals with a disease to those without
  • Advantages:
    • Small number of subjects
    • Relatively quick results
    • Low cost

Disadvantages

  • Bias
  • Odds ratio

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