Ace your NR503 midterm with this comprehensive study guide! Covering all key topics, including epidemiology concepts, public health policies, and data analysis techniques. This guide includes detailed notes, key definitions, and practice questions to ensure you understand the material thoroughly. P...
, NR 503 Midterm Exam
(Complete solutions and resources for the course exam)
Question 1
Which of the following statements best describe efficacy?
of the
• benefit of treatment under ideal conditions It is an estimate of the reduction of disease in treated groups
•
Question 2
A study is conducted for a pharmaceutical agent that has shown promise for reducing
heart disease among women. In order to more fully test the agent, an additional study is
done restricting the participants to be r&omized to those who have a history of
hypertension. Which of the following advantages cannot be claimed by the researchers?
The generalizability of the study is increased
Question 3
What is the main advantage of the r&omization of the 168 study participants to one of the two
drug treatment groups?
Reduces the potential for selection bias in allocation of treatment group
Question 4
After entry into the study, patients were first classified into three groups, those who had a
previous AMI, those with a first AMI who were at high risk for other cardiovascular diseases
such as congestive heart failure, & those with a first AMI who were at low risk for other
cardiovascular diseases. Which term best describes the study design?
R&omized clinical trial with stratified r&omization
Question 5
After assignment to treatment group, 77% of those in the placebo group were men,
while 80% of those in the drug X group were men. Which statement is most likely to be
true?
, • R&omization was successful since the investigators did not alter the selection of
participants in either group in order to ensure equal percentages of men
Question 6
A preliminary analysis was conducted after 6 months & found that 87% of
participants in the placebo group & 85% of those in the drug X group had
taken more than 90% of their prescribed dosages.
Which statement best describes this finding?
istics of patients who failed to comply with the treatment dosages should be assessed as they may differ from th
Question 7
Which of the following statements best describes the reason for conducting the
study as a double- blind trial?
Double blinding ensures that potential biases regarding selection, follow-up, & analysis can be reduced
Question 8
A multicenter double-blind r&omized study was carried out to compare the effect
of drug X with that of a placebo in patients surviving acute myocardial infarction
(AMI). Treatment with the drug started 7 days after infarction in 1,884 patients,
52% of all persons who were evaluated for entry into the study. 945 participants
were r&omized to treatment with drug X while 939 were assigned to the placebo
group. Patients were then followed for 12 months for reinfarction. There were 152
deaths in the placebo group & 98 in the group receiving drug X.
The researchers conclude that treatment with drug X reduces mortality in
patients who have had an AMI. The researchers are:
Correct because the rate of death is decreased in the drug X group
Question 9
The following data come from a study of approaches to smoking cessation.
Smokers who want to quit were r&omized to one of four groups: control group C
who received no intervention assistance, quitting guide group Q who received
brochures about how to quit smoking, quitting guide & support group QS who
received quitting brochures as well as social support brochures listing benefits of
smoking cessation, & telephone support group T who received the brochures & a
monthly phone call from a counselor. Participants received mailed surveys at 8,
16, & 24 months after r&omization. The results after 2 years are in the table
below. Which group had the least success in terms of quitting smoking?
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