Biostats

Question 1

Relative risk equation?

Answer 1

RR = risk of an outcome in an exposed group/ risk of the same outcome in an non exposed group

Question 2

What is a cross sectional analysis and what is it used for?

Answer 2

Data gathers at one point in time
Can determine prevalence of an outcome in a population
Identify specific risk factors and help generate hypothesis for further research

Question 3

False negative equation?

Answer 3

FN = 1- sensitivity x number of pts who truly have the disease

Question 4

True positive equation?

Answer 4

TP= Sensitivity x number of patients who truly have the disease

Question 5

Meta analysis

Answer 5

Groups results of several trials to increase statistical power and provide overall pooled effect estimates

Question 6

How to determine if CI is statistically significant

Answer 6

For odds ratio and relative risk the null value is 1 ( as long as CIS do not cross the null value it is statistically significant)

For difference the null value is 0