Question

1 Question

a) Create an example study scenario that would describe a cross-sectional study.

b) Explain the concept of a selection bias and give an example of selection bias that could occur in a case-control study.

c). Explain the concept of information bias and give an example of information bias that could occur in a case-control study.

d). What is matching and why is it a concern in case-control studies?

e). Summarize the study design, sampling, and purpose of the Framingham Study.

Answer 1

a) Cross sectional study means it includes same variables ( age ,gender,race,food habits,life style etc.,) except the one under study.

For example

It helps us to understand why pregnant mothers are prone to get anemia when underweight

b)selection bias means the selection of a randomised group of people or material related to study which has no effect

For example

Comparison of a particular disease with non affected individuals

c)Informational bias is also called as measurement bias or observational bias.Here the information is measured or calculated or interpreted inaccurately

For example recording errors in records.

d)Matching is a method used to do a study on basis of certain particular common thing

For example

Identifying same age and sex for a disease admitted in a single day