Video: Difference between a prospective and retrospective study
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In this article, you’ll learn
What is a retrospective study?
Differences between a prospective and retrospective study
What is a prospective study?
In medical research, a prospective study involves following a group of individuals (cohort) forward in time to observe how specific factors influence outcomes like onset of disease, death, remission, etc. Sometimes, researchers also follow 2 cohorts, one exposed and one not exposed to a specific risk factor (e.g., vitamin K shot at birth).
What is a retrospective study?
In medical research, a retrospective study involves analyzing existing data or records to investigate potential factors influencing an outcome that has already occurred. esearchers do not apply a treatment or intervention; they only observe and analyze data like patient charts, electronic health records, or public registries. Retrospective studies can be of two types:
- Case-Control Study: Compares a group of individuals with a disease (cases) to a group without the disease (controls) to examine past exposures.
- Retrospective Cohort Study: Identifies a cohort (group) and looks back at their historical records to compare outcomes based on past exposures.
Differences between a prospective and retrospective study
| Prospective Study | Retrospective Study | |||
| Definition | Follows participants forward in time from exposure to outcome | Looks backward using existing data to examine exposures and outcomes | ||
| Data Collection | Data collected in real time according to a predefined protocol | Uses previously recorded data (e.g., medical records, registries) | ||
| Control Over Variables | Greater control (can define variables and measurement methods in advance) | Limited control (restricted to available data and its quality) | ||
| Time & Cost | Time-consuming and often expensive | Faster and generally less expensive | ||
| Example | Tracking children of smokers over 10 years to study incidence of COPD | Reviewing hospital records of patients with myocardial infarction to assess prior risk factors | ||
Learn more: Watch this video
The speaker of this video is Karel Petrak, a researcher, writer, and an editor. He earned a D. Phil. degree for his thesis on breast cancer and has over 40 years of academic and applied research experience. With a prolific record, he has published over 100 preclinical and clinical research papers across pharmaceuticals, biology, medicine, and related areas, including genes, proteins, peptides, and small-molecule drug development. His proficiency extends to reviewing and editing manuscripts. Beyond language editing, he provides valuable insights into addressing researchers’ challenges in manuscript writing. His guidance covers content and structural advice, emphasizing adherence to target journals’ content and formatting requirements during manuscript submission.
