Hand Calculations: Measures of Morbidity & Mortality Assignment

Hand Calculations: Measures of Morbidity & Mortality

Question 1. Using influenza example, we saw that there were 63 cases of influenza in Philadelphia County, the number of people residing in the county is 1,526,006. What is the proportion of influenza cases in the county?


Question 2. A prevalence survey was conducted from January 1st-December 2012 andidentified 1,500 cases of schizophrenia in a city of 2 2 million persons. The incidence rate of schizophrenia in the population is 5/100,000 persons each year. What percentage of the 1,500 cases were newly diagnosed in 2012?


Question 3. In a study of 8,000 women who were 40-59 years of age, 175 new cases of disease x were diagnosed between January 1980 and December 1982. What was the incidence rate of disease X among the 40-59 year old women during that time interval?


Question 4. There were 72,486 deaths (all causes during the period January 1, 1973 to December 31, 1974 in residents of the Chicago metro area) among an estimated total population (at the period midpoint) of 7,345,962.

A. Calculate the crude mortality rate.

B. Of 12,244 deaths certified as myocardial infarction (MI) in Cook county in 1974, 792 occurred among white males aged 45-54. There were 423,872 white males 45-54 in the population. Calculate this age, race, sex-specific mortality rate.

c. Also during 1974, 163 MI deaths occurred among black males, aged 45-54. There were 44,643 black males aged 45-54 in the population. Calculate this age specific rate for black males.

D. Of 42,942 deaths (all causes) in 1974, 11,743 were certified as cancer. What is the proportionate mortality from cancer?

E. If there were 6,435 deaths certified from MI among 36,000 people with MI in 1973, what is the case fatality rate for Ml’s?


Question 5 The figure below shows data for a hypothetical cohort of 10 subjects who were studied as part of an open cohort study.

A. At the end of year 2000, how many person-years of follow-up are represented?

B. How many new subjects entered the cohort between January 1, 2001 and December 31, 2004?

c. If only two of the ten subjects developed lung cancer between January 1, 2000 and December 31, 2004, and these two subjects developed their cancer during calendar year 2001, what is the incidence rate per year of lung cancer among the 10-subject cohort (for partial years of follow-up, round up to the nearest whole year)?

D. 114 of the 10 subjects develop lung cancer between January 1, 2000 and December 31, 2004, what is the period prevalence for lung cancer among the group during the 5 year interval?

E. If two of the subjects in the study develop lung cancer between January 1, 2000 and December 31, 2001, what is the cumulative incidence of lung cancer among the subjects who had entered the study by the end of 2001?

F. If one subject had developed lung cancer during calendar year 2000, what would be the point prevalence of disease among the subjects in the cohort on December 31, 2000?

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