A total of 3000 workers at a particular industry were asked

A total of 3,000 workers at a particular industry were asked whether they had a history of hypertension or not at the beginning of their employment. Of the 3,000, 60% were males and 40% were 40-50 years of age and 60% were above the age of 50 years. Of the 3,000 workers, 600 reported a history of hypertension. Of the 600 cases of hypertension, 30% were males and 70% were above 50 years of age. What is the prevalence of hypertension in males and females?

A.

10% males, 35% females.

B.

35% males, 10% females.

C.

60% males, 35% females.

D.

35% males, 60% females

2. Within a small town in Belgium whose population is 500, initial testing and examination revealed 5 persons with tuberculosis (TB). Over the following 5 years, 10 more persons developed TB; 4 of these persons died during that time.
The 5-year case fatality of TB for the incident cases is:

A.

4/5

B.

4/10

C.

4/500

D.

4/15

E.

cannot be determined

3.Within a small town in New Zealand whose population is 500, initial testing and examination revealed 5 persons with tuberculosis (TB). Over the following 5 years, 10 more persons developed TB; 4 of these persons died during that time.

The 5-year risk of developing TB in this town was (assume that the population size is constant):

A.

5/500 or 10 per thousand

B.

5/ 495 or 10.1 per thousand

C.

20/500 or 40 per thousand

D.

10/495 or 20.2 per thousand person-years

E.

10/495 or 20.2 per thousand

Solution

Ans(1):

Given that 3000 workers were tested.
no of males = 60% of 3000= 1800
then no of females = 3000-1800 = 1200

given that 600 cases of hypertension
then no of males having hypertension out of 600 = 30% of 600= 180
then no of females having hypertension out of 600 = 600-180 = 420

then final answer is given by:
Prevalence of hypertension in male workers =(180/1800)*100 = 10%
Prevalence of hypertension in Female workers =(420/1200)*100 = 35%