Quiz on Incidence and Prevalence

In a population of 2,000 people, 40 new cases of a disease were reported over a one-year period. What is the incidence rate per 1,000 people per year?

• 10 cases per 1,000 people per year

• 15 cases per 1,000 people per year

• 20 cases per 1,000 people per year

• 25 cases per 1,000 people per year

In a city with a population of 100,000, a survey found that 1,200 people have diabetes. What is the prevalence of diabetes per 1,000 people?

• 12 cases per 1,000 people

• 15 cases per 1,000 people

• 18 cases per 1,000 people

• 20 cases per 1,000 people

In a study, 300 individuals were observed over six months. During this period, 15 developed a respiratory infection. What is the cumulative incidence of the infection over six months?

• 2.5%

• 5%

• 7.5%

• 10%

A study followed 400 smokers and 400 non-smokers. Among smokers, 80 developed heart disease, while among non-smokers, 20 developed heart disease. What is the relative risk of heart disease for smokers?

• 2.0

• 3.0

• 4.0

• 5.0

Using the data from question 4, calculate the attributable risk of heart disease among smokers.

• 0.10

• 0.15

• 0.20

• 0.25

If a disease has an incidence rate of 8 cases per 1,000 people per year and an average duration of 5 years, what is the approximate prevalence of the disease?

• 30 cases per 1,000 people

• 35 cases per 1,000 people

• 40 cases per 1,000 people

• 45 cases per 1,000 people

In a study of 500 participants over 12 months, 25 individuals developed high blood pressure. What is the cumulative incidence?

• 3%

• 4%

• 5%

• 6%

A group of 200 athletes and 200 non-athletes were followed in a study. Among the athletes, 10 developed asthma, and among the non-athletes, 40 developed asthma. What is the relative risk of asthma for athletes compared to non-athletes?

• 0.25

• 0.50

• 0.75

• 1.0

Using the data from question 8, calculate the attributable risk percentage for asthma among non-athletes.

• 55%

• 60%

• 65%

• 75%

In a cross-sectional survey of 20,000 people, 400 individuals were found to have chronic obstructive pulmonary disease (COPD). What is the prevalence of COPD per 1,000 people?

• 15 cases per 1,000

• 20 cases per 1,000

• 25 cases per 1,000

• 30 cases per 1,000