module 5 Flashcards
in prognostic factors does it cause the change in the outcome
no but it is associated with change
what is absolute risk
the incidence of adverse event or risk in a group
what is relative risk
the likelihood developing the outcome in the exposed vs the unexposed group
what does it mean if RR is greater than 1
positive association
exposure predicts or increases the likelihood of the outcome
what does it mean in RR =1
there is not association between exposure and outcome
what does it mean if RR<1
neg association
exposure prevnts or reduces the likelihood of the outcome
what is Odds ratio
the odds of being exposed in those with the outcome
vs
the odds of being exposed in those without the outcome
when are odds ratios used
in case control studies when there is no incident data
OR>1
+ association
exposure predicts or increases the outcome
OR =1
no association between exposure and the outcome
OR<1
- association
exposure protect against or reduces the likelihood of the outcome
what are hazard ratios
how often does an adverse event happen in one group compared to another group over time
time to event
what do survival curves show us
the percentage of the pop who survive or are free of outcome over a period of time
what value does survival curves start at
starts at 100%
what happens if the CI crosses 1
the results are no stat sig
