Understanding and appraising evidence

Question 1

What does one have to consider when assessing point prevalance?

Answer 1

• participation bias - who wasn’t there
• Demonimator population
• Self reporting erros
• Sensitivity (true positives) and specificty (true negatives)

Question 2

What is incidence

Answer 2

new cases in cohort/total number in cohort

Question 3

How is relative risk calculated

Answer 3

incidence in exposed group divided by incidence in non exposed group

Question 4

What is the difference between relative risk and odds ratio?

Answer 4

odds ratio: more retrospective (given that you have been a smoker you are .. More likely)

relative risk: prediction (if you start smokikng now you are .. More likely)