Which correctly defines sensitivity?
A) The ratio of the incidence rate in the exposed group to the incidence rate in the nonexposed group
B) Ability of a test to correctly identify people who have a health problem or the probability of testing positive if the health problem is truly present
C) Variations measured in hours, days, weeks, or months and commonly used to quantify outbreaks of infectious disease
D) Ability of a test to correctly identify people who do not have a health problem or the probability of testing negative if the health problem is truly absent
Ans: B
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Sensitivity is the ability of a test to correctly identify people who have a health problem or the probability of testing positive if the health problem is truly present. Relative risk ratio is the ratio of the incidence rate in the exposed group to the incidence rate in the nonexposed group. Short-term changes are variations measured in hours, days, weeks, or months and are commonly used to quantify outbreaks of infectious disease. Specificity is the ability of a test to correctly identify people who do not have a health problem or the probability of testing negative if the health problem is truly absent.
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