Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
formula for PPV
|
TP/TP + FP
|
|
formula for NPV
|
TN/TN + FN
|
|
formula for specificity
|
TN/(TN+FP)
|
|
how does PPV change with disease prevalence?
|
increases with increasing prevalence
|
|
how does NPV change with disease prevalence?
|
decreases with increasing prevalence
|
|
formula for number needed to treat (NNT)
|
1/ARR
|
|
formula for attributable risk percentage (ARP)
|
ARP = (RR-1)/RR
|
|
formula for attributable risk
|
incidence in exposed - incidence in unexposed
|
|
relationship between mean, median, and mode in positively skewed distribution (tail to the right)
|
mean > median > mode
|
|
relationship between mean, median, and mode in negatively skewed distribution (tail to the left)
|
mean < median < mode
|
|
define susceptibility bias
|
subgroup of selection bias that occurs when the treatment regimen selected for a patient depends on the severity of the patient's condition
|
|
main measure of association in case-control study
|
exposure odds ratio
|
|
difference between case control and retrospective cohort studies
|
in case control, outcome of interest has already developed
in retrospective cohort, subjects sorted by exposed and unexposed, but no subject has outcome of interest at the time the study starts |
|
appropriate test to compare two means
|
two-sample t-test
|
|
type of bias introduced when patients are lost to follow-up
|
selection
|