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Difficulty: MediumStudy Design

A team of pediatric researchers is investigating a hypothesized link between maternal exposure to a widely used agricultural pesticide during the first trimester of pregnancy and the development of a rare congenital biliary malformation. This specific malformation has an estimated incidence of 1 in 250,000 live births. The pesticide has been in widespread use in specific agricultural regions for over two decades. The investigators have access to a comprehensive state-wide pediatric electronic health record system and aim to determine if an association exists. They need to complete the investigation rapidly due to limited funding. Which of the following epidemiological study designs is the most efficient and appropriate method for this investigation?

  1. Case-control studyAnswer
  2. B
    Prospective cohort study
  3. C
    Retrospective cohort study
  4. D
    Cross-sectional study
  5. E
    Randomized controlled trial

Answer

Case-control study
The correct answer is a case-control study because it is the most statistically and economically efficient design for investigating rare diseases. In this scenario, the incidence of the malformation is exceedingly low (1 in 250,000). A case-control study operates by identifying patients who already have the condition (cases) and matching them to a similar group of patients without the condition (controls). Researchers then look back in time, using the electronic health record system, to compare the frequency of maternal pesticide exposure between the two groups. This circumvents the need to follow a massive denominator of exposed and unexposed individuals.

Step-by-Step Solution

1
Identify the primary research objective and the specific epidemiological characteristics of the outcome being studied.
The objective is to evaluate a potential association between an exposure (pesticide) and a congenital malformation that is extremely rare (incidence of 1 in 250,000 live births).
The rarity of the outcome is the most critical factor in determining the feasibility and efficiency of various epidemiological study designs.
2
Evaluate the practical constraints of the investigation described in the scenario.
The investigation must be completed rapidly and efficiently due to limited funding, utilizing existing electronic health records.
Study design selection must account for time, cost, and the availability of data.
3
Select the study design that optimally matches these parameters.
A case-control study is selected as the best method.
By identifying individuals who already have the rare disease (cases) and comparing their past exposures to a group without the disease (controls), researchers can evaluate associations efficiently without needing to track an enormous population over time.

Key Concept

Epidemiological Study Design Selection for Rare Diseases
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Topics

Study Design

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