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Define sensitivity:
The ability of a test, case definition, or surveillance system to identify true cases
Define specificty:
The ability or a test, case definition, or surveillance system to exclude persons without the health condition of interest.
How is sensitivity calculated?
Groups being tested for differences have some underlying difference which is not controlled.
What is positive predictive value?
The proportion of patients or outbreaks detected by surveillance who truly have the disease (or are true outbreaks).
How is specificity calculated?
How is positive predictive value calculated?