Epidemiology Exam #5 2024/2025 Exam
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Which of the following is a case-control study?
a) An analysis in which researchers combine quantitative results from many
similar studies to come up with an overall summary of the association between
an exposure and a disease
b) An analysis of trends in the occurrence of a disease over several previous
decades to create predictions of its future occurrence
c) Study of the incidence of cardiovascular disease in women who have given
birth
d) Obtaining histories and other information from a group of known cases and
from a comparison group to determine the relative frequency of a characteristic
or exposure under study
e) Both a and c - 🧠ANSWER ✔✔d) Obtaining histories and other information
from a group of known cases and from a comparison group to determine the
relative frequency of a characteristic or exposure under study
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,In a case-control study, which of the following is true?
a) The proportion of cases with the exposure is compared with the proportion
of controls with the exposure
b) Disease rates are compared for people with the factor of interest and for
people without the factor of interest
c) The investigator may choose to have multiple comparison groups
d) Recall bias is a potential problem
e) a, c, and d - 🧠ANSWER ✔✔e) a, c, and d
In which one of the following types of study designs does a subject serve as his
or her own control?
a) Prospective cohort study
b) Retrospective cohort study
c) Case-crossover study
d) Case-cohort study
e) Case-control study - 🧠ANSWER ✔✔c) Case-crossover study
Questions 5-8 use the following information:
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, The use of cellular phones has been associated with the development of brain
cancer, as evidenced in several studies. However, other studies have shown no
such association. The table below includes the results of a case-control study of
brain tumors and the regular use of cellular phones. This study was conducted
using a control group made up of a random sample of the population of high
school students who attended the same schools where the students with brain
tumors were found.
How many study subjects were cases?
a) 63
b) 96
c) 159
d) 477 - 🧠ANSWER ✔✔c) 159
How many study subjects were controls?
a) 292
b) 477
c) 159
d) 185 - 🧠ANSWER ✔✔b) 477
What proportion of cases were exposed?
Page 3 of 18
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
Questions and Answers 100%
Guaranteed Success | Already Rated A+
Which of the following is a case-control study?
a) An analysis in which researchers combine quantitative results from many
similar studies to come up with an overall summary of the association between
an exposure and a disease
b) An analysis of trends in the occurrence of a disease over several previous
decades to create predictions of its future occurrence
c) Study of the incidence of cardiovascular disease in women who have given
birth
d) Obtaining histories and other information from a group of known cases and
from a comparison group to determine the relative frequency of a characteristic
or exposure under study
e) Both a and c - 🧠ANSWER ✔✔d) Obtaining histories and other information
from a group of known cases and from a comparison group to determine the
relative frequency of a characteristic or exposure under study
Page 1 of 18
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
,In a case-control study, which of the following is true?
a) The proportion of cases with the exposure is compared with the proportion
of controls with the exposure
b) Disease rates are compared for people with the factor of interest and for
people without the factor of interest
c) The investigator may choose to have multiple comparison groups
d) Recall bias is a potential problem
e) a, c, and d - 🧠ANSWER ✔✔e) a, c, and d
In which one of the following types of study designs does a subject serve as his
or her own control?
a) Prospective cohort study
b) Retrospective cohort study
c) Case-crossover study
d) Case-cohort study
e) Case-control study - 🧠ANSWER ✔✔c) Case-crossover study
Questions 5-8 use the following information:
Page 2 of 18
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
, The use of cellular phones has been associated with the development of brain
cancer, as evidenced in several studies. However, other studies have shown no
such association. The table below includes the results of a case-control study of
brain tumors and the regular use of cellular phones. This study was conducted
using a control group made up of a random sample of the population of high
school students who attended the same schools where the students with brain
tumors were found.
How many study subjects were cases?
a) 63
b) 96
c) 159
d) 477 - 🧠ANSWER ✔✔c) 159
How many study subjects were controls?
a) 292
b) 477
c) 159
d) 185 - 🧠ANSWER ✔✔b) 477
What proportion of cases were exposed?
Page 3 of 18
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER:
619652435. TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED
