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Related Concept Videos

Study Design in Statistics01:15

Study Design in Statistics

A study design is a set of techniques that allow a researcher to collect and analyze data from different variables defined for a specific research problem. Statistics is commonly for effective study design and more robust experiments,
Does aspirin reduce the risk of heart attacks? Is one brand of fertilizer more effective at growing roses than another? Is fatigue as dangerous to a driver as the influence of alcohol? Questions like these are answered using randomized experiments with proper...
Bioequivalence Experimental Study Designs: Repeated Measures, Cross-Over, Carry-Over, and Latin Square Designs01:15

Bioequivalence Experimental Study Designs: Repeated Measures, Cross-Over, Carry-Over, and Latin Square Designs

Bioequivalence experimental study designs play a pivotal role in testing the effectiveness of various treatments. Key among these are the repeated measures, cross-over, carry-over, and Latin square designs. In the repeated measures design, each subject receives all treatments, allowing for temporal comparisons. This type of design is useful in reducing variability but requires careful planning to avoid bias.The cross-over design, an economical method, involves sequential administration of...
Study Designs in Epidemiology01:20

Study Designs in Epidemiology

Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
Observational studies are those where the researcher does not intervene but rather observes natural variations. They include cross-sectional, cohort, and case-control studies.
Longitudinal Research02:20

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
Group Design02:01

Group Design

The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between the two are due to...
Regression Toward the Mean01:52

Regression Toward the Mean

Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when researchers try to extrapolate results...

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A Within-Subject Experimental Design using an Object Location Task in Rats
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The Rotterdam Study: objectives and design update.

Albert Hofman1, Monique M B Breteler, Cornelia M van Duijn

  • 1Department of Epidemiology & Biostatistics, Erasmus Medical Center, Rotterdam, The Netherlands. a.hofman@erasmusmc.nl

European Journal of Epidemiology
|October 24, 2007
PubMed
Summary

The Rotterdam Study, a long-term Dutch cohort, investigates age-related diseases like cardiovascular and neurological conditions. Its extensive findings inform public health strategies and disease prevention efforts.

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Area of Science:

  • Epidemiology and Public Health
  • Gerontology and Geriatric Medicine
  • Cardiovascular and Neurological Sciences

Background:

  • The Rotterdam Study is a major prospective population-based cohort study initiated in 1990 in the Netherlands.
  • It focuses on the determinants and progression of common age-related diseases, including cardiovascular, neurological, ophthalmological, and endocrine disorders.
  • The cohort comprises approximately 15,000 individuals aged 45 years and older, providing a robust dataset for epidemiological research.

Purpose of the Study:

  • To investigate the causes, progression, and prevention of major age-related diseases.
  • To provide a comprehensive summary of the study's design, rationale, and significant findings to date.
  • To update on the evolving objectives and methodologies employed in this ongoing research initiative.

Main Methods:

  • Prospective cohort design with long-term follow-up.
  • Inclusion of a large population-based sample (approx. 15,000 subjects aged 45+).
  • Focus on cardiovascular, neurological, ophthalmological, and endocrine diseases.

Main Results:

  • Over 600 research articles and reports published, disseminating key findings.
  • Significant contributions to understanding the epidemiology of age-related diseases.
  • Established a rich resource for investigating multifactorial health conditions in older adults.

Conclusions:

  • The Rotterdam Study has yielded substantial insights into the epidemiology of age-related diseases.
  • Its design and extensive data collection support ongoing research into health and aging.
  • The study continues to be a vital resource for public health and clinical research.