Lecture 8 - Cross Sectional Study

Question 1

What type of study is a cross sectional study?

Answer 1

Analytic observational study

Question 2

What is a cross-sectional study?

Answer 2

Where exposure and outcome are assessed at the same point in time

You just collect data at a certain tike point

Question 3

What is a problem with cross-sectional study?

Answer 3

Provides no information with regards to the influence of time on the variables measured

Question 4

What are the strengths of a cross-sectional study?

Answer 4

Cheap (unless a massive nationwide survey)
Good for studying prevalence of a condition
Can study associations of multiple exposures and outcomes
Generating study hypotheses (cant tell you the association)

Question 5

What are the weaknesses of a cross sectional study?

Answer 5

-Causality cannot be assessed
-Findings may be time sensitive
-selection all bias
-generalisability

Question 6

What is selection bias?

Answer 6

the bias introduced by the selection of individuals, groups, or data for analysis in such a way that proper randomization is not achieved, thereby failing to ensure that the sample obtained is representative of the population intended to be analyzed

So findings = INCORRECT

Question 7

What is generalisability?

Answer 7

When findings are correct, but applying these findings to other situations or populations may be problematic (external validity)

Question 8

How does stratified sampling help mitigate selection bias?

Answer 8

Helps ensure that the sample population more accurately reflects the entire population

Question 9

Do biases and confounders in a study depend on the type of study design?

Answer 9

No not the TYPE of study design the Actual study design and nature of data