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Step 3- Biostats

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zms2187's version from 2015-12-01 02:35

Section

Question Answer
Likelihood ratio does NOT vary with ______Prevalence of disease
Verification bias? i.e workup bias, when a study uses the gold standard diagnostic tool SELECTIVELY to confirm a + or - result which can cause overestimation of sens (or underest of spec.)
common in retrospective studies, subjects with certain exposures are more likely to report negative outcomes than control subjectsrecall bias
subjects over or under report exposure history due to perceived social stigmatizationreporting bias
# needed to harm =1/absolute risk increase= 1/ (incident rate of exposed - incident rate of unexposed)
# needed to treat =1/absolute risk reduction = 1/
memorize
OR = axd / bxc
Question Answer
another term for external validitygeneralizability
what type of bias happens with poor data collection with inaccurate resultsmeasurement bias
memorize