Epidemiology Classwork

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Questions and Answers

What is the person-time rate for diabetic women, and how does it relate to the mortality rate?

The person-time rate is 0.0386 deaths per person-year, which is equivalent to 38.6 deaths per 1,000 person-years. This indicates the rate of mortality in diabetic women.

How does the incidence rate of AIDS in 2003 compare to the mortality rate of diabetic women?

The incidence rate of AIDS is 15.21 new cases per 100,000 population, whereas the mortality rate of diabetic women is 38.6 deaths per 1,000 person-years.

What is the purpose of using a denominator in calculating the incidence rate of a disease?

The denominator provides the total population at risk, allowing for the calculation of a rate that can be compared across different populations.

How does the morbidity rate of diabetic women compare to that of nondiabetic women?

The morbidity rate of diabetic women is 38.6 deaths per 1,000 person-years, whereas the morbidity rate of nondiabetic women is 13.9 deaths per 1,000 person-years. Signup and view all the answers

What is the association between diabetes and mortality in women, based on the provided data?

The data suggests that diabetic women have a higher mortality rate than nondiabetic women. Signup and view all the answers

How would you use hypothesis testing to investigate the relationship between diabetes and mortality in women?

A hypothesis test could be used to determine whether the difference in mortality rates between diabetic and nondiabetic women is statistically significant. Signup and view all the answers

What is the term used to describe the calculation of the risk of illness among persons who ate potato salad in the outbreak of gastroenteritis?

Food-specific attack rate Signup and view all the answers

In the diabetes follow-up study, what is the total number of person-years observed for the diabetic women?

1,862 person years Signup and view all the answers

What is the formula used to calculate the risk of death among diabetic men in the given example?

Risk = (Number of deaths among diabetic men / Total number of diabetic men) × 100 Signup and view all the answers

What is the term used to describe the rate of death over a specific period of time?

Incidence rate Signup and view all the answers

In the diabetes follow-up study, what is the total number of deaths among diabetic women?

72 Signup and view all the answers

What is the purpose of calculating the incidence rate in the diabetes follow-up study?

To compare the rates of death between diabetic and nondiabetic women. Signup and view all the answers

What is the prevalence of multivitamin use among the 1,150 women in the study?

40.7% Signup and view all the answers

Distinguish between incidence proportion and incidence rate. Provide an example of each.

Incidence proportion is the proportion of an initially disease-free population that develops disease, becomes injured, or dies during a specified period of time. Incidence rate is a measure of incidence that incorporates time directly into the denominator. For example, if 100 out of 189 diabetic men died during a 13-year follow-up period, the incidence proportion would be 100/189, whereas the incidence rate would be the number of deaths per 100 person-years. Signup and view all the answers

Calculate the risk of death for diabetic men during the 13-year follow-up period, given that 100 of the 189 diabetic men died.

100/189 = 0.5294, or approximately 52.94% Signup and view all the answers

What is the difference between incidence and prevalence in epidemiological studies?

Incidence refers to the number of new cases of disease or injury in a population over a specified period of time, while prevalence refers to the proportion of a population that has a particular characteristic or disease at a specific point in time. Signup and view all the answers

How would you calculate the person-time rate of incidence from a long-term cohort follow-up study?

By dividing the number of new cases of disease by the total person-time at risk, usually expressed as a rate per 100 person-years. Signup and view all the answers

What is the significance of knowing the incidence proportion in a disease-free population?

It allows us to estimate the risk of developing disease, injury, or death during a specified period, which is essential in epidemiological studies and public health planning. Signup and view all the answers

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