Question

Population of the city of Atlantis on 3/30/12 was 183,000. Number of new chronic bronchitis cases due to air pollution occurring between January 1 and June 30 = 26.

Number of active chronic bronchitis cases due to air pollution according to the city registrar on June 30 = 264.

Find the incidence rate per 100,000 population of chronic bronchitis cases for the six month period.

Find the prevalence per 100,000 population of active chronic bronchitis cases as of June 3.

Answer 1

Incidence rate can be defined as the new number of cases of a disease that occur duringa specific period of time in a population. It can be calculated by using the formula: Number of new cases of a disease occuring in a population during a specified period of time Number of persons who are at risk of developing the disease during that period of time Incidence x 1,000

From the above calculation of the incidence rate it can be said that the active cases of TB for the 6-month period was 14 per 100,000 populations.

The given data is: Total population of city of Atlantis on March 30, 2012 183,000 Number of new cases of TB occurring between January 1 and June 30, 2012 = 26 Number of active TB cases according to city register on June 30, 2012 264 From the given data prevalence rate for the month of June can be calculated as follows Prevalence can be calculated from the formula: Number of cases of a disease present in the population at a specified time Prevalence per 1 000 Number of in persons in the population at that specified time Where Number of cases of a disease present in population at a specified time (June 30, 2012) Number of persons in the population at that specified time183,000 264 Number of cases of a disease present in the population at a s ified time Prevalence rate- Number of persons in the population at that specified time 264 183,000 Prevalence rate- 0.00144 144 Therefore, Prevalence rate 100,000