1.Prevalence of a disease in a certain population is 2.7 / 1000. If one million

ID: 108681 • Letter: 1

Question

1.Prevalence of a disease in a certain population is 2.7 / 1000. If one million people live in that population, how many have the disease?

2.7

270

2700

2. Prevalence is higher when the duration of the disease is longer and the incidence of the disease is higher.

True or False?

3. Prevalence has to do with existing cases of a disease but incidence has to do with new cases developed through time.

True or False?

4. We followed 250 people, each for 8 years. How many person-years of follow-up did we have?

250

1000

2000

250

1000

2000

1) 1 million =10^6

It is given Prevalence of a disease in a certain population = 2.7 / 1000

If one million people live in that population,number of people that have the disease = (2.7/1000) *10^6

= 2700

2) Prevalence = Average Duration of Disease times the Incidence Rate

Prevalence is higher when the duration of the disease is longer and the incidence of the disease is higher is a true statement.

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