When the onset of symptoms of a disease occur, the disease has entered which stage?

An epidemiologist is studying the rate of heart disease within a population. Heart disease is a chronic disease and it is often unclear when the disease first began in patients. What would be the best rate to use in describing heart disease?

Of the 45 children not receiving the mumps vaccine, 18 develop mumps and the remaining 27 did not. What was the risk of developing the mumps for the unvaccinated children?

The infant mortality rate is usually expressed as number of deaths per 1,000 live births

The Spanish flue of 1918 was unusual because elderly women died much more than any other segment of the population

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

Match the following measures of mortality frequency with the best definition

Increasing the number of immunized individuals in a population results in increased ______________?

Measures of dispersion or variation include such measurements as mean, median or mode

The proportionate mortality rate compares deaths due to a given disease to the deaths due to all causes in the same time period