BIOSTATS and Pharmacoeconomics Flashcards Preview

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Flashcards in BIOSTATS and Pharmacoeconomics Deck (8)
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1
Q

BIOSTATS:

What is the equation for relative risk (RR)?

A

RR = risk in tx group
—————
Risk in control

2
Q

BIOSTATS:

How do you calculate relative risk reduction? (RRR)

A

RRR = 1 - RR
= % risk control - % risk tx
———————–
% risk control

3
Q

BIOSTATS:

What is RRR?

A

Relative risk reduction is the % the risk of event is reduce by being in the treatment group

4
Q

BIOSTATS:

What is ARR?

A

ARR is absolute risk reduction or the difference in risk that can be attributed to the treatment group

5
Q

BIOSTATS:

How do you calculate absolute risk reduction (ARR)

A

ARR = % risk in control group - % risk in tx group

6
Q

BIOSTATS:

What is NNT?

A

NNT is the number needed to treat in order to theoretically prevent one event

7
Q

BIOSTATS:

How do you calculate NNT?

A

NNT = 1/ARR
= 1
————————-
(% risk control - % risk tx)

8
Q

BIOSTATS:

What is the equation for “risk?”

A

Risk = # subjects w/ event
——————–
# subject in that arm