USMLE Biostats Flashcards
1
Q
Case control study
A
Odds ratio
2
Q
Cohort study
A
Relative risk
3
Q
Cross sectional study
A
Associations and prevalence
4
Q
Recall bias
A
Aware of effect more likely to recall it
5
Q
Measurement bias
A
Measurement is messed up, use standardized measurement method
6
Q
Sampling bias
A
Too sick (Berkson), too healthy (healthy worker effect), non-response
7
Q
Observer bias
A
Self fulfilling prophecy - expecting an effect, fix with blinding and placebo
8
Q
Procedure bias
A
Not treated the same, fix with blinding and placebo
9
Q
Confounding bias
A
Not on causal pathway
10
Q
Lead-time bias
A
Early detection confused with increased survival
11
Q
Positive skew effect on mean, median, mode?
A
Mean > median > mode
12
Q
Negative skew effect on mean, median mode?
A
Mean
