Question: Answer the following:

1. A large hospital discharges 43,121 per year. Among those, approximately 12% are readmitted within 30 days. What measure of disease frequency is this (prevalence, incidence, cumulative incidence)?
2. On July 1 ^st , 2015 there were 45 people in Alabama with tuberculosis. What measure of disease frequency is this (prevalence, incidence, cumulative incidence)?
3. If the positive predictive value of a diagnostic test is high, what can you conclude about the rate of false positives?
4. When is an ecologic study useful?

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