HPEX 358 - Introduction to Epidemiology Final Exam
(chapters 7 - 12) Questions With Complete Solutions
A bias that results from procedures used to select study subjects
and from factors that influence participation in the study is
called: Correct Answer selection bias
A case control study assessed the possible preventive effect of
oral contraceptive on a woman's risk of having osteoporosis
(bone disease). Among the women with osteoporosis, 484 were
identified as user of oral contraceptive and 347 as non-user of
oral contraceptive. On the other hand, among the women
without osteoporosis, 620 were identified as user of oral
contraceptives and 380 as non-users. What is the estimated
measure of association between use of oral contraceptives and
having osteoporosis? Correct Answer 0.85
A cohort study examined the effect of repeat chlamydia
infections on the occurrence of pelvic inflammatory disease
(PID). Among the 1,000 women with repeat chlamydia
infections, 240 developed PID. Among the 2,000 women with
no repeat chlamydia infections, 160 developed PID. Using the
proper measure of association, the estimated risk of PID for
women with repeat chlamydia infections was: Correct Answer
3.00 times
A matched case-control study is one in which: Correct Answer
the cases and controls have been matched according to one or
more criteria
, A study compared a new screening test for cervical cancer to the
gold-standard of confirmed diagnosis of cervical cancer with
cervical tissue biopsy. Data from that study showed that cervical
cancer was confirmed for 200 and not confirmed for 1,600
people with cervical tissue biopsy. The new screening test came
positive for 50 of the confirmed cervical cancer cases and came
negative for 1,500 of the not confirmed cases. What is the
predictive value positive of this new screening test? Correct
Answer 33%
A study compared a new screening test for cervical cancer to the
gold-standard of confirmed diagnosis of cervical cancer with
cervical tissue biopsy. Data from that study showed that cervical
cancer was confirmed for 200 and not confirmed for 1,600
people, with the cervical tissue biopsy. The screening test came
positive for 50 of the confirmed cervical cancer cases and came
negative for 1,500 of the not confirmed cases. What is the
predictive value negative of this screening test? Correct Answer
91%
A study compares the prevalence of back pain among current
members of the automobile manufacturing union with that of
current members of the bakers and confectionary union. It is a:
Correct Answer ecological study
A study in which the units of analysis are populations or groups
of people rather than individuals is a: Correct Answer ecologic
study
A study wants to explore the association between colonoscopy
screening and death from colon cancer at the state level. The
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