Biostatistics Flashcards

1
Q

What is the mean?

A

Average

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2
Q

What is the Median?

A

Middle value

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3
Q

What is the Mode?

A

Most frequent value

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4
Q

What does sensitivity tell you?

A

People that have the disease w/ pos test

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5
Q

What does specificity tell you?

A

People that don’t have the disease w/ neg test

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6
Q

What does positive predictive value tell you?

A

Probability of having a disease w/ a pos test

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7
Q

What does negative predictive value tell you?

A

Probability of not having a disease w/ neg test

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8
Q

What does incidence tell you?

A

New cases
(Rate per unit time)

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9
Q

What does prevalence tell you?

A

Total cases
(At one time)

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10
Q

What does the Odds Ratio tell you?

A

Diseased are x times more likely to see risk factor

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11
Q

What does a Confidence Interval = 95% tell you?

A

95% sure it lies within the interval

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12
Q

What does Relative Risk tell you?

A

Risk of getting disease w/ known exposure

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13
Q

What is NNT?

A

Number Needed to Treat to change 1 life

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14
Q

What does a p-value <0.5 tell you?

A

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

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15
Q

What does a Null hypothesis tell you?

A

Nothing’s happening

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16
Q

What does Power tell you?

A

Probability of detecting a true intervention

17
Q

What is a type I error?

A

p-value error
False negative

“Too optimistic”

18
Q

What is a type II error?

A

Power error
False positive

“Too pessimistic”

19
Q

What is Accuracy?

A

Validity

“Truth”

20
Q

What is Precision?

A

Reliability

“Keep making the same mistake”

21
Q

What are the phases of clinical trials?

A

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
Q

What is a Cohort study?

A

Prospective study that provides incidence (new cases)
Uses Relative Risk (RR)

23
Q

What is a Case Control study?

A

Retrospective study that provides prevalence (total cases)
Uses Odds Ratio (OR)

24
Q

What is a cross-sectional study?

A

Provides prevalence
“Snapshot”

25
Q

What is a Case Report?

A

Describes an unusual patient

26
Q

What is a Case Series report?

A

Describes several unusual patients

27
Q

What are Consensus panels?

A

Panel of experts provides a recommendation

28
Q

What is Clinical wisdom?

A

“I think…” paper

29
Q

What is a Meta-analysis?

A

Tries to combine data from many trials