Epidemiology

Question 1

List the Hierarchy of Studies

Answer 1

Individual case reports
Cross-sectional studies
Ecological studies
Case-controll studies
Cohort studies
Randomised control trials 
Systrmatic review

Question 2

Explenatins for Assosiation in Studies

Answer 2

Bias (faulty study design)
Chance(1 in 20 chance for medicine)
Confound –> Age, Sex, socio-economic status (other linked factor is cause)
Causation

Question 3

Bias

Answer 3

Selectional Bias
Measurment bias –> e.g. unclear classification of bias
Recall bias –> more likely to report certain illnesses

Question 4

List Bradford Hill Criteria

Answer 4

Crutial: Temporal relationship
Other: Optional:
- plausible explenatin
- consistensy with other observations
- strength of association
- Dose-response relationship
- Specifity
- Experimental evidence
- Coherence
- Analogy
- reversibility

Question 5

Odds ration

Answer 5

Odds of exposure in case decided by odds of exposure in control

Show how (much more) likely it is for thing to occur