Statistics, Things Frequently Forgotten Flashcards
LR values of 2, 5, 10
15%, 30%, 45%
Absolute AR (AR)
patients w/ event / total number of patients
Relative Risk (RR)
EER / CER
Absolute Risk Reduction (ARR)
EER - CER
Relative Risk Reduction
EER - CER / CER
NNT
1 / ARR or 1 / EER - CER
Metabolic Acidosis Calculations
Winters, 1.5xHCO3 + 8
Chronic: HCO3+15
Observational Type of Studies
Case Control
Cohort
Prevalence influcences which measures?
PPV & NPV
More prevalence = more true positives
Less prevalence = more false positives
Prevalence =
percent of ppl in a population who have disease at any one time
i.e. who widespread it is
Statitisical measure used to help indiciate usefullness of screening test
PPV
Sentinel event =
death or serious harm
Type 1 Error
concludes there is a difference between the groups when there is NOT
Type 2 Error
concludes there is NO difference between groups when there IS one
Half lifes to reach steady state?
5