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Soru

Zorluk: OrtaStudy Design

A group of researchers is investigating the long-term risk of developing end-stage renal disease (ESRD) in patients with a history of chronic proton pump inhibitor (PPI) use. Utilizing a comprehensive national healthcare database, they identify 8,500 patients who were prescribed continuous PPI therapy between 2008 and 2010. They also identify 25,500 patients without any PPI prescriptions during that same period, matching them by age, sex, and baseline renal function. The research team then examines the longitudinal medical records of all participants from their index date in 2010 through December 2025 to compare the incidence of newly diagnosed ESRD between the two groups. Which of the following best describes this epidemiological study design?

  1. A
    Case-control study
  2. B
    Cross-sectional study
  3. C
    Nested case-control study
  4. D
    Prospective cohort study
  5. Retrospective cohort studyCevap

Cevap

Retrospective cohort study
The correct study design is a retrospective cohort study. In this scenario, the investigators identify two groups of patients based on an exposure that occurred in the past (PPI use versus no PPI use between 2008 and 2010). They then utilize a historical database to trace these patients forward in time (from 2010 to 2025) to determine the incidence of a specific outcome (ESRD). Even though the direction of inquiry is forward (from exposure to outcome), it is considered 'retrospective' because both the exposure and the subsequent outcome had already occurred by the time the study was initiated.

Adım Adım Çözüm

1
Determine how the study groups were initially defined.
The researchers grouped the participants based on whether they received PPI therapy (exposure) or not.
Grouping by exposure rather than outcome immediately identifies the study as a cohort study, ruling out case-control designs.
2
Analyze the direction of inquiry relative to the exposure.
The researchers traced the participants' medical records forward in time from 2010 to 2025 to measure the incidence of ESRD (outcome).
Tracking from exposure to outcome confirms it is a cohort study measuring disease incidence.
3
Establish the chronological relationship between the study events and the time the study is being conducted.
Both the exposure window (2008-2010) and the outcome tracking period (through 2025) occurred in the past relative to the time of the investigation.
Because the outcomes have already occurred and historical data is used to track the cohort forward, the design is a retrospective cohort study rather than a prospective cohort study.

Anahtar Kavram

A retrospective (historical) cohort study identifies participant groups based on past exposure status and utilizes historical records to follow them longitudinally into a more recent past to determine the incidence of an outcome.
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Study Design

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