Loss of follow-up is a problem in most cohort studies and often introduces bias. It is a situation in which a researcher loses contact with a subject, resulting in missing data. Too many subjects failing follow-up diminish the internal validity of the study.
<h3>What is follow-up loss in cohort studies? </h3>
- Follow-up loss introduces bias (observed deviation of relevant measures from what would have been observed without bias) if there is a difference in the likelihood of loss due to follow-up related to exposure status and outcome.
- In the clinical research trials industry, loss due to follow-up is defined as patients who were actively participating in a clinical research trial at some point but who lost themselves (due to errors in the computer tracking system or due to unavailability).
- In cohort studies: 1) Imaging outcome, is loss of follow-up. 2) These are essentially prospective studies, so confounding factors are not an issue. 3) These studies help examine multiple outcomes from a single, infrequent exposure. 4) These are usually faster and cheaper than case-control studies.
<h3>What are advantage and disadvantages of cohort studies?</h3>
- In general, the main advantage of cohort studies is the ability to study multiple exposures and multiple endpoints in a single cohort. This recording allows you to select index groups, so you can explore rare recordings.
- A major weakness of cohort studies is that this type of study design can be time consuming and expensive for results that are rare or evolve over long periods of time. It's a question of research.
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Answer:
astronomy
Explanation:
he looked at stars and other cosmic objects and furthered space exploration
Answer: There are "Currently over 106,000 people in the U.S. on the waiting list for an organ transplant.
Explanation: Over 106,000 people
Answer:
What bests describes the context of President Roosevelt's remarks is gaining support for the new deal.
The state is named after its capital, Tlaxcala, which was also the name of the pre-Columbian city and culture. The Tlaxcalans allied with Spain and defeated the Aztecs. Concessions from Spain allowed the territory to remain largely intact throughout 300 years of colonial rule.
The alliance of the Spaniards with the Tlaxcalans is his one of the most important events in the history of Mexico. This European alliance with the Totonac and Tlaxcalan Indians produced a formidable coalition that would eventually lead to the downfall and destruction of the entire Aztec Empire.
Tlaxcala has his three famous bullrings. The most popular is Plaza Jorge "El Ranchero" Aguilar, built in the 18th century in the center of Tlaxcala town. Today it is known for its farms and weaving. Tlaxcala has a long and rich history of cultural diversity.
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