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Flashcards in USMLE Biostats Deck (12):
1

Case control study

Odds ratio

2

Cohort study

Relative risk

3

Cross sectional study

Associations and prevalence

4

Recall bias

Aware of effect more likely to recall it

5

Measurement bias

Measurement is messed up, use standardized measurement method

6

Sampling bias

Too sick (Berkson), too healthy (healthy worker effect), non-response

7

Observer bias

Self fulfilling prophecy - expecting an effect, fix with blinding and placebo

8

Procedure bias

Not treated the same, fix with blinding and placebo

9

Confounding bias

Not on causal pathway

10

Lead-time bias

Early detection confused with increased survival

11

Positive skew effect on mean, median, mode?

Mean > median > mode

12

Negative skew effect on mean, median mode?

Mean