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Retired NBME 21 Answers

nbme21/Block 1/Question#44 (reveal difficulty score)
A test has been developed to screen for human ...
Predictive value of a positive test ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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submitted by โˆ—pparalpha(93)
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Prevalence of disease high=high PPV=high pretest probability

NPV varies inversely with prevalence or pretest probability

p. 257 of FA

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submitted by โˆ—drzed(332)
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If more people have the disease in your population, then the chance of a positive test result actually being positive will increase -- more people have the disease, so you're more likely to be "right"

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