Relative Risk
EER
# of experimental group with event/total # in experimental group
RRR
(1-RR) RR is the risk in the exposed population divided by the risk in the unexposed population
number needed to treat
NNT=1/ARR usually expressed over a particular time frame
risk of getting disease in exposed population
a/(a+b)
risk of getting the disease in the exposed population over the risk in the unexposed population
a/(a+b)/c/(C+d) aka relative risk
risk of getting disease in unexposed population
c/(c+d)
experimental/exposed event rate
is the risk of getting the positive (or negative) event in the experimental (or exposed) population
when relative risk is under 1
it means it is protective. exposed group less likely to develop disease than other group
absolute risk reduction (ARR)
risk in the unexposed population minus the risk in the exposed population control event rate-experimental event rate
control event rate (CER)
risk of getting the positive (or negative) even in the control group ( or non exposed group) this is also expressed as a percentage
relative risk
we can measure the incidence of an outcome in the exposed group vs in the unexposed group ratio of disease in exposed groups versus incidence of disease in the unexposed