Question

1. In Fantasy City between January 1 and December 31, 2006, 35 new cases of tuberculosis were diagnosed. There were an additional 300 “old” cases on the list of active cases on December 31, 2006. The population of Fantasy City was 400,000. Due to tuberculosis, 20 deaths have been recorded during this 1 year period.
   1. What is the incidence rate per 100,000 population for tuberculosis during 2006?
   2. What is the prevalence rate of tuberculosis per 100,000 on December 31, 2006?
   3. What is the cause-specific death rate per 100,000 for tuberculosis?

Answer 1

SOLUTION:

Number of active cases till dec 31st = 300

New Cases between jan 1st and dec 31st = 35

Number of deaths = 20

Population = 400,000

1) Incidence rate = No. of disease onsets / Sum of person-time @ risk

= 300 / 400,000 = 0.00075 per year = 7 persons per 10,000

2) Prevelence rate = Number of cases / Population size

= 335 / 100,000 = 0.003 per year = 3 cases per 1000

3) Case fatality rate = no. of deaths in that year / total number of cases of that disease

= 20 / 335 = 0.059

Case fatality rate per 100,000 = 0.059 * 100,000 = 5900 cases

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