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Flashcards in Biostatistics Deck (28)
1

What is the Mean?

Average

2

What is the Median?

Middle value

3

What is the Mode?

Most frequent value

4

What does sensitivity tell you?

People that have the disease w/+ test

5

What does specificity tell you?

People that don't have the disease w/- test

6

What does Positive Predictive Value tell you?

Probability of having a disease w/+ test

7

What does Negative Predictive Value tell you?

Probability of not having a disease if have a negative test

8

What does Incidence tell you?

New cases (rate per unit time)

9

What does Prevalence tell you?

Total cases (at one time)

10

What does the Odds Ratio tell you?

Diseased are x times more likely to see risk factor

11

What does a Confidence Interval = 95% tell you?

95% sure it lies within the interval

12

What does Relative Risk tell you?

Risk of getting disease w/known exposure

13

What is NNT?

Number Needed to Treat to change 1 life

14

What does a p value< 0.5 tell you?

Random chance that you will be wrong 1 time out of 20

15

What does a Null hypothesis tell you?

Nothing's happenin'

16

What does a Power tell you?

Probability of detecting a true intervention

17

What is a Type I error?

P value error, false negative "too optimistic"

18

What is a Type II error?

Power error, false positive "too pesimistic"

19

What is Accuracy?

Validity "truth"

20

What is Presicion?

Reliability "keep making the same mistake"

21

What are the phases of clinical trials?

Phase I: Toxicity "hurt pt?"
Phase II: Efficacy "help pt?"
Phase III: Comparison "any better?"
Phase IV: Post-marketing surveillance "can they screw it up?"

22

What is a Cohort study?

Prospective study that provides incidence (new cases), uses RR

23

What is a Case Control Study?

Retrospective study that provides prevalence (total cases), uses Odds Ratio

24

What is a Cross Sectional study?

Provides prevalence "snapshot"

25

What is a Case Series report?

Describes several unusual pts

26

What are Consensus Panels?

Panel of expert provides a recommendation

27

What is Clinical wisdom?

"I think..." paper

28

What is a Meta-analysis?

Tries to combine data from many trials