2x2 Table

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odds ratio, relative risk

What can you calculate using the 2x2 table?

.05

What does the P-value need to be less then to trust your findings?

a*d/ b*c

What is the formula for odds ratio?

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

What is the formula for relative risk?

a/ a+b

What is the formula for the attack rate of the exposed?

c/ c+d

What is the formula for the attack rate of the unexposed?

Odds Ratio

used in case-control study

Relative Risk

used in cohort study

P-value

the measure of how confident you are that your findings are correct; determines whether the results of the study can be used

attack rate

the rate that a group experienced an outcome or illness equal to the number sick divided by the total in that group

2x2 table

A table which has two columns and rows for people with or without exposure and with or without disease; shows the number of people with each characteristic


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