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15 Cards in this Set
- Front
- Back
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formula for PPV |
TP/TP + FP |
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formula for NPV |
TN/TN + FN |
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formula for specificity |
TN/(TN+FP) |
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how does PPV change with disease prevalence? |
increases with increasing prevalence |
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how does NPV change with disease prevalence? |
decreases with increasing prevalence |
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formula for number needed to treat (NNT) |
1/ARR |
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formula for attributable risk percentage (ARP) |
ARP = (RR-1)/RR |
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formula for attributable risk |
incidence in exposed - incidence in unexposed |
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relationship between mean, median, and mode in positively skewed distribution (tail to the right) |
mean > median > mode |
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relationship between mean, median, and mode in negatively skewed distribution (tail to the left) |
mean < median < mode |
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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 |
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main measure of association in case-control study |
exposure odds ratio |
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difference between case control and retrospective cohort studies |
in case control, outcome of interest has already developed |
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appropriate test to compare two means |
two-sample t-test |
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type of bias introduced when patients are lost to follow-up |
selection |
