Now that you have read Chapter 3, answer the following questions. For some of there questions, there will be more than one correct answer. Select all that apply.

1. Which of the following are frequency measures?
   A. Birth rate
   B. Incidence
   C. Mortality rate
   D. Prevalence
   Use the following choices for Questions 2–4.
2. Ratio
3. Proportion
4. Incidence proportion
5. Mortality rate
6. __# women in Country A who died from lung cancer in County A

women in Country A who died from cancer in 2004

3. __# women in Country A who died from lung cancer in 2004 # women in County A who dies from breast cancer in 2004
4. __ # women in County A who died from lung cancer in 2004

women living in County A on July 1, 2004

5. All proportions are ratios, but not all ratios are proportions.
   A. True
   B. False
6. Investigators enrolled 100 diabetics without eye disease in a cohort (follow-up) study. The results of the first 3 years were as follows:
   Year 1: 0 cases of eye disease detected out of 92; 8 lost to follow-up
   Year 2: 2 new cases of eye disease detected out of 80; 2 had died; 10 lost to follow-up
   Year 3: 3 new cases of eye disease detected out of 63; 2 more had died; 13 more lost to follow-up
   The person-time incidence rate is calculated as:
   A. 5 ⁄ 100
   B. 5 ⁄ 63
   C. 5 ⁄ 235
   D. 5 ⁄ 250
7. The units for the quantity you calculated in Question 6 could be expressed as:
   A. cases per 100 persons
   B. percent
   C. cases per person-year
   D. cases per person per year
   Use the following diagram for Questions 8 and 9. Assume that the horizontal lines in the diagram represent duration of illness in 8 different people, out of a community of 700.
8. What is the prevalence of disease during July?
   A. 3 ⁄ 700
   B. 4 ⁄ 700
   C. 5 ⁄ 700
   D. 8 ⁄ 700
9. What is the incidence of disease during July?
   E. 3 ⁄ 700
   F. 4 ⁄ 700
   G. 5 ⁄ 700
   H. 8 ⁄ 700
10. What is the following fraction?

Number of children < 365 days of age who died in Country A in 2004
Estimated mid-year Number of live births in County A in 2004
I. Ratio
J. Proportion
K. Incidence proportion
L. Mortality rate

DUE: October 16
Each question 2 points