Case control and cohort studies

Case control and cohort studies

A case authority and companion methods are widely used in the epidemiology. What do they learn? They investigate the causal bound between factors of risk and diseases. There is a significant difference between them. In what occasions you should choose to use one or the other?

Cohort study

Group education got its name from a faction of disease-free citizens. The squad is assembled by being or not affected by a specific occasion of illness. Cohort education of the whole assembly allows seeing for some time – new diseases differ for both groups.

Companion training could be done if there is a suspicion on the natural bond between the prevalence of diarrhea and the using of a particular water source to kids younger six in a countryside where there are various water sources.

Companion design occasion means selecting a group of kids younger six, kids certain age in the country, or kids who live nearby or attend the same hospital. After that, you categorize kids as using the similar water source or other ones. In let’s say two weeks it’s necessary to inspect the appearance of diarrhea.

Next step of companion design education is to investigate the diarrhea occasions among children which using same water source and children which use another.

Authority (control) education

It could be used to explore the similar features. However, case-control study starts with the selection of those with sickness and controlling them avoiding the disease. Education case control supposes to select those people who could have been a research issue in a way they had evolved the sickness.

For any of variants and controls, the vulnerability to a possible occasion of a sickness is defined.

For any of examples and commands, the emerging of the potential cause of illness can also be investigated. It’s possible to make a collation of those who complain about diarrhea with children having other complaints, like respiratory infections. It’s necessary to decide what drinking source those children used and calculated the rate of controls and occasions exposing to the suspected drinking source.

How to choose between authority education and cohort design?

Advantages and disadvantages of the body case education are following:

  • Companion studies give the top information on the occasion of sickness, while you control people from the very beginning of submission to the illness occurrence. Partner education lets you explore cumulative cases, while they are the most streamlined measure of the disease development risks.
  • Another advantage of the companion case education is the chance of examining some conditions and outcomes which were caused by the same submission – heart disease, renal sickness or lung cancer caused by smoking.
  • The cohort study may take longer periods of time while diseases may occur much later after submission. Thus, it is a pretty expensive authority education method.
  • They are very efficient for rare submission, where you can select people presented to a particular feature. For unique types of sickness, it is not efficient.

Features and options of the case control education

Authority training can be conducted relatively easy. It doesn’t demand an extended controlling period, while the sickness has evolved. Unlike cohort design, this one is mostly helpful for rare diseases, while you choose the occasions by your own. However, it is not necessary for rare cases, while it’s almost impossible to find them in a sufficient number in the study. Moreover, the case control design is appropriate for the diseases having a long latent period, for example, cancer.

Case study samples