Biostats Flashcards
How to calculate sensitivity?
A/A+C, how many people with the disease are picked up by test
How to calculate specificity?
D/D+B How many people without the disease were correctly diagnosed without disease
How do you calculate attributable risk?
A/A+B - C/C+D
type of research study comparing group of people with disease to group without disease?
case control
type of research study comparing group with given risk factor or exposure to a group without that risk?
cohort
type of research study people randomly assigned?
randomized control
How do you calculate relative risk?
A/A+B / C/C+D
How do you calculate absolute risk reduction?
C/C+D - A/A+B
how do you calculate NNT?
1/absolute risk reduction
type of bias where individuals who have adverse outcome have different likelihood of recalling exposure?
recall bias
type of bias where early detection may be confused with increase in survival?
lead time bias
type of bias where association between an exposure and outcome distorted by another variable?
confounding bias
type of bias subjects in different arms of a study are systematically treated differently?
procedure bias
type of bias where information is distorted by way it is gathered?
measurement
