Question 1 1.
Which of the following measures is best for understanding how quickly a disease is occurring in a population?
Answer
| A. | prevalence | | B. | cumulative incidence | | C. | Incidence density | | D. | None of the above. | | E. | |
5 points
Question 2 1.
Dr. Breathright conducted a study to estimate the incidence of asthma among inner city children. She recorded the amount of follow-up person-time in the table below. The number of children diagnosed as a new case of asthma during the 12 month follow-up period was 15 cases. Which of the following equations could be used to correctly calculate incidence density for asthma in this study? Complete the table to help you determine the answer.
Participant follow-up: | No. of participants | Number of Months of Observation per participant | Total Person-Months | | 100 | 12 | | | 90 | 11 | | | 65 | 8 | | | 50 | 7 | | | 10 | 5 | | Totals | 315 | 43 | | Answer | A. | 15 cases / 3110 person-months at-risk | | B. | 15 cases / 315 children at-risk | | C. | 315 cases / 3,110 person-months at-risk | | D. | None of the above |
5 points
Question 3 1.
In Newcity, TX, there were 70,000 women over age 25 years at the beginning of 2007. Of these women, 3,000 had breast cancer at the beginning of 2007. At the beginning of 2008, 25,000 of the women in the population are currently cancer free and are at-risk for postmenopausal breast cancer. These women participated in a cohort study and contributed 40,000 person-years of follow-up time at risk from 2008-2010. Collectively, they experienced 112 new cases of postmenopausal breast cancer by the end of the study in 2010.
What is the cumulative incidence of postmenopausal breast cancer at the end of the cohort study in 2010? (use of multiplier of 10,000 women)
Answer