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Flashcards in Ethics and biostats Deck (42)
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1

type of study that measures disease prevalence

cross-sectional

2

type of study that measures the odds ratio

case control

3

study that measures relative risk

cohort

4

sensitivity equation

TP/(TP+FN) or A /A+C

5

specificity equation

TN /TN+FP or D/B+D

6

PPV equation

TP/TP +FP or A/A+B

7

NPV equation

TN/TN+FN or D/D+C

8

draw the double bell curve of sens/spec

TN/FN/FP/TP

9

What likelihood ratios are significant?

LR+ > 10 and LR - <0.1

10

LR + equation

sensitivity/1-spec or TP rate/FP rate

11

LR - equation

1-sens/spec or FN rate/TN rate

12

increased sensitivity does what to a predictive value

increase NPV

13

decreased specificity does what to a predictive value

decrease PPV

14

increased specificity does what to a predictive value

increase PPV

15

decreased sensitivity does what to a predictive value

decrease NPV

16

OR equation

a/b / c/d = ad/bc

17

RR equation

a/(a+b)/ c/(c+d)

18

RR = 1 means

no association

19

RR >1

increased risk

20

RR <1

decreased risk

21

difference in risk between exposed and unexposed groups

attributable risk

22

AR equation

a/ a+b - c/c+d

23

the difference in risk attributable to the intervention compared to the control

ARR

24

RRR equation

RRR = 1-RR

25

the proportion of risk reduction attributable to the intervention as compared to the control

RRR

26

ARR equation

c/c+d - a/a+b

27

NNT equation

1/ARR

28

NNH equation

1/AR

29

bias when study pop is from hospital and less healthy

berkson bias

30

pygmalion effect

self-fullfilling prophecy