24/01/2022
Environmental epidemiology
Practice questions: rate, ratio& proportion
On July 7, 1995, 100 people in Lusaka were invited by Mr. Junk foods for dinner. All of them ate the food that was served for dinner. The next day (July 8, 1995) 90 of the 100 people who ate that food developed diarrhea.
Calculate and interpret the attack rate of diarrhea which occurred on July 8, 1995.
If 30 of 10 000 hookahs commonly known as sh**ha smokers developed lung cancer over a 10-year period, while 3 of 10 000 non- smokers developed lung cancer over the same period;
Draw up a 2x2 table and populate it using the information above
What is the incidence of cancer occurring in the exposed?
What is incidence of cancer occurring in the unexposed?
Between 2005 and 2010, as part of the Zambia National Public Health Institute Survey, 7,381 persons’ aged 40-77 years were enrolled in a follow up study. At the time of enrolment, each study participant was classified as having or not having diabetes. During 2016- 2018, enrollees were documented either to have died or were still alive. The results are summarized as follows:
Classification
Original enrolment
(2005-2010)
Dead at follow- up
( 2016-2018)
Diabetic men
189
100
Non-diabetic men
3,151
811
Diabetic women
218
72
Non-diabetic women
3, 823
511
Calculate the ratio between the diabetic men and nondiabetic men.
Calculate the ratio between the diabetic men and women.
Calculate the proportion of men in the ZNPHIS follow-up study who were diabetics.
Calculate the proportion of deaths among men.
Calculate the risk of death for these men.
In 2003, 400 new cases of acquired immunodeficiency syndrome (AIDS) were reported among final year students at Unilus .
The estimated final-year student population at unilus in 2003 was approximately 4, 200.Calculate the incidence rate of AIDS among students at unilus in 2003.
Ryan has ebola. He comes into contact with 10 people.of these 10 people, 2 get sick. What is the secondary attack rate?