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Question 1

Interpret the following parameters

If the confidence interval crosses 1

Example

95%CI 0.9-1.1

Answer 1

implies there is no difference between arms of the study.

Question 2

If a trial comparing neutrogena to placebo with the outcome of reduction in acne spots found the following

Intervention arm
Odds of acne reduction with Neutrogena = 0.8

Placebo arm
Odds of acne reduction with placebo = 0.2

What is the odds ratio?

Answer 2

0.8 / 0.2 = 4

Intervention / Placebo

Question 3

Interpret an odds ratio of 4

Answer 3

If OR greater than 1 the control is better than the intervention

Question 4

Interpret an odds ratio of 4

Answer 4

If OR greater than 1 the control is better than the intervention

The odds of reducing acne is 4