Evidence-Based Practice

Question 1

What is Berkson bias?

Answer 1

Berkson bias is when patients for both control and cases are selected from the HOSPITAL population not the general population

Question 2

What is recall bias?

Answer 2

Recall bias is when those that have been exposed have a greater likelihood of recalling exposure

Question 3

How do you calculate the number needed to treat (NNT) of an intervention?

Answer 3

1 / Absolute Risk Reduction
(rounded to the nearest whole number)

Question 5

What is the number needed to benefit for the shingles vaccine in older adults?

Answer 5

50
(need to vaccinate 50 people to prevent 1 case of shingles)