Cohort Studies

Cohort Studies; is a study design where one or more people (called cohorts) are followed and subsequent status evaluations with respect to a disease or outcome are conducted to determine which participants exposure characteristics (risk factors) are associated. As the study is conducted, outcome from participants in each cohort is measured and relationships with specific characteristics determined.

Cohort studies usually observe large groups of individuals and record their exposure to certain risk factors to find clues as to the possible causes of disease. They can be prospective studies that gather data going forward, or retrospective cohort studies, which look at data already collected.
This type of research can also help identify social factors that influence health.

The fundamentals of a cohort study:

a. Identify people who are free of disease at the beginning of the study
b. Assemble cohorts of exposed and unexposed individuals
c. Follow cohorts for the development of incident outcomes
d. Compare the risks of incident outcomes in each cohort

Advantages

1. Cheaper & easier than a randomized controlled trial (RCT)
2. Standardization of criteria/outcome
3. Matched subjects, which limits the influence of confounding variables

Disadvantages

1. Cohorts can be difficult to identify from confounding variables
2. No randomization, which means that imbalances could exist
3. Blinding/Masking is difficult
4. Outcome of interest can take a long time to occur

For Answers to any questions you may have please call Dr. Jimenez at 915-850-0900