HSC4501 HWQ3

Population of the city of Orlando on March 30, 2012 = 200,000 No. of new active cases of TB occurring between January 1 and June 30, 2012 = 30 No. of active TB cases according to the city register on June 30, 2012 = 400 The incidence of active cases of TB for the 6-month period was per 100,000 population, and the point prevalence of TB was per 100,000

1: 15 2: 200

A prevalence survey conducted from January 1 through December 31, 2016, identified 1000 cases of breast cancer in a city of 2 million persons. The incidence rate of breast cancer in this population is 10/100,000 persons per year. What percent of the 1,000 cases were newly diagnosed in 2016?

20 %

A group of researchers are interested in conducting a clinical trial to determine whether a new cholesterol-lowering agent was useful in preventing coronary heart disease (CHD). They identified 12,000 potential participants for the trial. At the initial clinical exam, 300 were discovered to have CHD. The remaining subjects entered the trial and were divided equally into the treatment and placebo groups. Of those in the treatment group, 550 developed CHD after 5 years of follow-up while 450 developed CHD during the same period in the placebo group. What was the incidence of CHD during the 5-year study (per 1000 persons)?

85.5

It was reported that heart disease incidence in county X during year 2010 was 300 per 100,000. This statistic is a:

Cumulative incidence

In calculating incidence of chicken pox in day-care Y during year 2015, the numerator is the number of chicken pox cases in day-care Y during 2015. The denominator is those who were susceptible to chicken pox during 2015 using mid-year day care population in 2015. In this case, "susceptible" or "person at risk" include:

Those never been vaccinated and never had chicken pox