random epi facts

Question 1

Berkson’s bias

Answer 1

bias from using a sample of hospitalized patients

Question 2

Observer bias (aka)

Answer 2

Pygmalion effect. Countered by double-blinding.

Question 3

Hawthorne bias

Answer 3

Patients who are aware that they are in a study act differently

Question 4

Attrition bias is a kind of?

Answer 4

Selection bias. Loss of follow-up among persons with a risk factor leads to nonuniform selection.