Question

A cohort study is being planned to investigate whether regular swimming reduces the risk of developing asthma.

(a) How you would design a cohort study to investigate whether regular swimming reduces the risk of developing asthma. Explain how you would select study participants, describe the exposure and the outcome (and how you would measure these), and explain how you would carry out the study, including how you would try to minimise chance, bias, and confounding affecting the results.

(b) What are the advantages of a cohort study for answering this research question?

Answer 1

(a) I will design the Cohort Study by taking- 4 group of population

One who do swimming and develop asthma.

One who do swimming and doesn't develop Asthma

One who doesn't do swimming and develop asthma

One who doesn't do swimming and doesn't develop asthma.

Exposure	Cases ( Developed Asthma)	Controls(Doesn't Develop Asthma)
Swimmers	-	-
Non-Swimmers	-	-

Bias Can be Minimised by - Blinding ( Single , Double and Triple blinding)

Confunding can be controlled by-

• Randomissation
• Restriction
• Matching
• Stratification
• Statistical Modeling
• Statified Randomisation

(b) Advantages of Cohort Study in this Study is -

• It provides Incidence
• Also Provides Relative Risk
• No Recall Bias
• More Accuracy/ Validity
• Can Study Variety of Other risk factors Together