CH 4-4 Risks and Odds Flashcards

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1
Q

How would you set up a Generalized Table Summarizing Results of a Prospective Study?

A
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2
Q

What do we arrive at when we calculate:

P(event occurring in treatment group) - P(event occurring in control group)

A

absolute risk reduction

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3
Q

What is the formula for absolute risk reduction using information from the gerneralized table?

A
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4
Q

In what type of studies is relative risk used for?

A

Prospective study

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5
Q

What notation is used for proportion (or incidence rate) of some characterisitc in a treatment and control group?

A
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6
Q

How do you calculate the relative risk (risk ratio/RR)?

A
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7
Q

What is the number of subjects that must be treated in order to prevent one event?

A

number needed to treat (NNT)

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8
Q

What is the formula to find the number needed to treat (NNT)?

A
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9
Q

What is the formula for the actual odds against?

A
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10
Q

What is the formula for the actual odds in favor?

A
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11
Q

In retrospective and prospective studies, what is a measure of risk found by evaluating the ratio of the odds in favor of the treatment group to the odds in favor of the control group?

A

Odds Ratio (OR or relative odds)

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12
Q

What is the formula for the odds ratio?

A
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13
Q

Why is relative risk only used in prospective studies?

A

In retropsective studies researchers can choose disease case that are different that the actual incidence rates

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