Lab: The Occurrence of Disease
What is the diarrhea attack rate in persons who ate both ice cream and pizza?
What is the overall attack rate in persons who did not eat ice cream?
Which of the food items (or combination of items) is most likely to be the infective item(s)?
A. Pizza only
B. Ice cream only
C. Neither pizza nor ice cream
D. Both pizza and ice cream
E. Cannot be assumed from the data shown
A prevalence survey conducted from January 1 through December 31, 2003 identified 580 new cases of tuberculosis in a city of 2 million persons. The incidence rate of tuberculosis in this population has historically been 1 per 4,000 persons each year.
What is the incident rate of tuberculosis per 100,000 persons in 2003?
Has the risk of tuberculosis increased or decreased during 2003?
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 12,327 potential participants for the trial. At the initial clinical exam, 309 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, 505 developed CHD after 5 years of follow-up while 477 developed CHD during the same period in the placebo group.
What was the prevalence of CHD at the initial exam per 1,000 persons?
What was the incidence of CHD during the 5-year study per 1,000 persons?
The population of a city on February 15, 2005, was 36,600. The city has a passive surveillance system that collects hospital and private physician reports of influenza cases every month. During the period between January 1 and April 1, 2005, 2,200 new cases of influenza occurred in the city. Of these cases, 775 persons were ill with influenza according to surveillance reports on April 1, 2005.
The monthly incidence rate of active cases of influenza for the 3-month period per 1,000 persons was:
9. Among 13,963,753 males and 14,272,325 females, there were 20,734 cases of prostate cancer and 19,107 cases of female breast cancer.
a. Calculate the incidence rates of prostate cancer and female breast cancer. Express your answer using a rate of 100,000.
b. Calculate the incidence rates of female breast cancer. Express your answer using a rate of 100,000.