NR 503 EPIDEMIOLOGY MIDTERM EXAM
1. Which of the following are examples of a population prevalence rate?
Correct! : The number of persons with hypertension per 100,000 population
2. The table above describes the number of illnesses and deaths caused by
plague in four communities. The case-fatality rate associated with plague is
lowest in which community?
Correct Answer : Community C
3. What would be the effect on age-specific incidence rates of uterine cancer if
women with hysterectomies were excluded from the denominator of
incidence calculations assuming that most women who have had
hysterectomies are older than 50 years of age?
Correct! : Rates would increase in women older than 50 years of age but
may decrease in younger women as they get older.
4. A disease has an incidence of 10 per 1,000 persons per year, and 80% of
those affected will die within 1 year. Prior to the year 2000, only 50% of
cases of the disease were detected by physician diagnosis prior to death. In
the year 2000, a lab test was developed that identified 90% of cases an
average of 6 months prior to symptom onset; however, the prognosis did not
improve after diagnosis. Which statement is true concerning the duration of
the disease after the development of the lab test?
Correct! : Mean duration of a case of the disease is longer in 2000
5. For colorectal cancer diagnosed at an early stage, the disease can have 5-
year survival rates of greater than 80%. Which answer best describes early
stage colorectal cancer?
Correct! : Incidence rates will be much higher than mortality rates
, 6. A study found that adults older than age 50 had a higher prevalence of
pneumonia than those who were younger than age 50. Which of the
following is consistent with this finding?
Correct Answer: Incidence rates do not vary by age, but older adults have
pneumonia for a longer duration compared to younger adults
1. The population of a city on February 15, 2005, was 36,600. The city has a
passive surveillance system that collects hospital and private physician
reports of influenza cases every month. During the period between January 1
and April 1, 2005, 2,200 new cases of influenza occurred in the city. Of
these cases, 775 persons were ill with influenza according to surveillance
reports on April 1, 2005. The prevalence rate of active influenza as of April
1, 2005, was:
Correct! 20 per 1,000 population
2. The population of a city on February 15, 2005, was 36,600. The city has a
passive surveillance system that collects hospital and private physician
reports of influenza cases every month. During the period between January 1
and April 1, 2005, 2,200 new cases of influenza occurred in the city. Of
these cases, 775 persons were ill with influenza according to surveillance
reports on April 1, 2005. The monthly incidence rate of active cases of
influenza for the 3-month period was:
Correct! 20 per 1,000 population
3. What would be the effect on age-specific incidence rates of uterine cancer if
women with hysterectomies were excluded from the denominator of
incidence calculations assuming that most women who have had
hysterectomies are older than 50 years of age?
Correct!: Rates would increase in women older than 50 years of age but
may decrease in younger women as they get older.
1. Which of the following are examples of a population prevalence rate?
Correct! : The number of persons with hypertension per 100,000 population
2. The table above describes the number of illnesses and deaths caused by
plague in four communities. The case-fatality rate associated with plague is
lowest in which community?
Correct Answer : Community C
3. What would be the effect on age-specific incidence rates of uterine cancer if
women with hysterectomies were excluded from the denominator of
incidence calculations assuming that most women who have had
hysterectomies are older than 50 years of age?
Correct! : Rates would increase in women older than 50 years of age but
may decrease in younger women as they get older.
4. A disease has an incidence of 10 per 1,000 persons per year, and 80% of
those affected will die within 1 year. Prior to the year 2000, only 50% of
cases of the disease were detected by physician diagnosis prior to death. In
the year 2000, a lab test was developed that identified 90% of cases an
average of 6 months prior to symptom onset; however, the prognosis did not
improve after diagnosis. Which statement is true concerning the duration of
the disease after the development of the lab test?
Correct! : Mean duration of a case of the disease is longer in 2000
5. For colorectal cancer diagnosed at an early stage, the disease can have 5-
year survival rates of greater than 80%. Which answer best describes early
stage colorectal cancer?
Correct! : Incidence rates will be much higher than mortality rates
, 6. A study found that adults older than age 50 had a higher prevalence of
pneumonia than those who were younger than age 50. Which of the
following is consistent with this finding?
Correct Answer: Incidence rates do not vary by age, but older adults have
pneumonia for a longer duration compared to younger adults
1. The population of a city on February 15, 2005, was 36,600. The city has a
passive surveillance system that collects hospital and private physician
reports of influenza cases every month. During the period between January 1
and April 1, 2005, 2,200 new cases of influenza occurred in the city. Of
these cases, 775 persons were ill with influenza according to surveillance
reports on April 1, 2005. The prevalence rate of active influenza as of April
1, 2005, was:
Correct! 20 per 1,000 population
2. The population of a city on February 15, 2005, was 36,600. The city has a
passive surveillance system that collects hospital and private physician
reports of influenza cases every month. During the period between January 1
and April 1, 2005, 2,200 new cases of influenza occurred in the city. Of
these cases, 775 persons were ill with influenza according to surveillance
reports on April 1, 2005. The monthly incidence rate of active cases of
influenza for the 3-month period was:
Correct! 20 per 1,000 population
3. What would be the effect on age-specific incidence rates of uterine cancer if
women with hysterectomies were excluded from the denominator of
incidence calculations assuming that most women who have had
hysterectomies are older than 50 years of age?
Correct!: Rates would increase in women older than 50 years of age but
may decrease in younger women as they get older.
