In a study concerned with the possible effects of air pollution on the developme
ID: 2936055 • Letter: I
Question
In a study concerned with the possible effects of air pollution on the development of chronic bronchitis, the following data were obtained. A population of 9,000 men 45 years of age or older was examined in January 2010. Of these, 6,000 lived in areas with high levels of air pollution and 3,000 lived in areas with low levels of air pollution. At the initial examination, 120 cases of chronic bronchitis were discovered, 90 among those living in areas with high levels of air pollution. All the men initially examined who did not have chronic bronchitis were available for subsequent repeated examinations during the next 5 years. These examinations revealed 268 new cases of chronic bronchitis and of those 30 lived in areas with low levels of air pollution. What is prevalence of chronic bronchitis among men 45 years of age or older who lived in areas with high levels of air pollution in January 2010? A. 1% B. 1.5% C. 1.3% D. 0.5% E. 40.1 per 1000
Explanation / Answer
revalence of chronic bronchitis among men 45 years of age or older who lived in areas with high levels of air pollution in January 2010 = ?
Here people living in low level pollution areas= 3000
total new cases of chronic bronchitis = 268
new case of chronic bronchitis in high pollution areas = 268 - 30 = 238
Prevalance rate = 238/ (6000 - 90) * 100 = 40.2 per 1000