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A major weakness of case-control studies is what?

A group of 152 schoolchildren received a new vaccine for mumps and were compared to a group of 45 children who did not receive the vaccine. Of those who were vaccinated, 14 developed mumps while the remaining 138 did not.  What was the risk of developing the mumps for the vaccinated children?

Based on the calculated risk in the above questions, what is the efficacy of the mumps vaccine?

Period prevalence is used to describe the amount of a disease in an interval of time

Which of the following is NOT true about the median of a sample

An outbreak of measles was reported due to a decrease in vaccination rates. In 4 months, 126 new cases were reported with a total of 14 fatalities. What is the case-fatality rate for this disease?

A classic curve with several peaks of disease outbreak, with each peak showing an increase in the number of cases since the last peak are indicative of what type of disease outbreak?

A dichotomous variable has three possible choices (ie. A, B, C)

Incidence rates are the most common way to measure frequency of a disease in a population.

In 1988, a total of 14,551 deaths (see breakdown in table) in Missouri were attributed to heart disease. The mid-year population was 5,080,000. Of that population, 2,618,900 were males and 2,461,100 were females. Based on the information provided, what is the mortality (per 1000 individuals) due to heart disease in males? HeartDisease(1)(2).jpg