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Flashcards in Biostats Deck (17)
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1

true positive/ (true positive + false negative)

Sensitivity

2

probability that a patient with a disease will have (+) test result

Sensitivity (sensitive test rules out)

3

true negative/ (true negative + false positive)

Specificity

4

probability that a patient w/out a disease will have a (-) test result

Specificity (specific test rules in/ confirms)

5

true positive / (true positive + false positive)

PPV (positive predictive value) = probability of disease

6

A/(A+B) - C/(C+D) =

Attributable risk (disease in exposed/all exposed - disease unexposed/all unexposed)

7

# new cases/ pop at risk

incidence

8

# existing cases/ pop at risk

prevalence

9

study that compares group with a disease to group without disease

case control

10

compares group with a given risk/exposure to a group without that risk/exposure

cohort

11

(A/(A+B))/(C/(C+D))

Relative Risk (risk of + in exposed/all exposed / risk of + in unexposed/all unexposed)

12

(disease in placebo/all placebo) - (disease in tx/ all tx)

Absolute Risk Reduction

13

1/Absolute Risk Reduction

Number Needed to Treat

14

bias in which early detection can be confused with increased survival

lead time bias

15

bias in which subjects in different arms of a study are systematically treated differently

procedure bias

16

95% of data is within how many standard deviations?

2

17

Odds ratio

(AD)/(BC)