EPID 309 Midterm Questions with Complete Solutions (Latest 2025) Random assignment of subjects to study groups helps to
control for: - Correct Answers ✅Biases due to confounding
Your Public Health internship preceptor at Pima County Health Department asks you to collect background data on cancer
rates for the US. You start by going to: - Correct Answers
✅SEER
You don't have to worry about external validity in: - Correct
Answers ✅None of the above. You have to worry about external validity in all study designs.Use of a double blind study design can help reduce - Correct Answers ✅information bias.You would like to assess the effectiveness and efficiency in delivering health services through your clinic. After selecting a 10% sample of all patient visits during the past six months, you are able to characterize the patient population utilizing your clinic in terms of age, sex, race, method of referral, diagnostic category, daily patient load, clinic staff work
schedules. This study is: - Correct Answers ✅Cross-
sectional
The most important advantage of cohort studies is: - Correct
Answers ✅It allows us to determine both the relative risk and the attributable risk 1 / 3
EPID 309 Midterm Questions with Complete Solutions (Latest 2025) In a clinical trial investigating at the efficacy of Mohs surgery
to remove cancers the best control would be: - Correct
Answers ✅A sample from the population of individuals receiving standard care Researchers hypothesize that older students are more effective learners. They assemble groups of students from UA Gen Ed courses and collect demographic and academic information. This kind of study is - Correct Answers ✅cross sectional A research team is analyzing the association between leukemia and exposure to benzene among factory workers.They use the population of Allentown PA for their study, which has a population of 10,000 people. Out of this, a total of 1,000 factory workers are recruited into the study (653 males and 347 females). In this sample, 13 individuals have leukemia. A total of 263 of the participants are exposed to benzene in the workplace; 9 of them have leukemia. Using these data, - Correct Answers ✅they calculate an Odds Ratio and conclude that there is a positive association where cases are more likely to report exposure to benzene.A group of 728 women from the UA campus were recruited to participate in a research study to determine the risk of developing depression. At the beginning of the study, 38 women were diagnosed as depressed. Over the course of a year, an additional 23 women were diagnosed with 2 / 3
EPID 309 Midterm Questions with Complete Solutions (Latest 2025) depression (3 in October, 15 in November and 5 in December). Over the year, 3 deaths among these women were attributed to depression. The likelihood that a UA
woman will develop depression in a year is: - Correct
Answers ✅5% Researchers interested in understanding the association between helmet use and injury severity survey students on the UA campus with respect to bicycle safety and injury
sustained. The study design was: - Correct Answers
✅Cross-sectional study A study of 39 cases of disease X were identified from a state registry and an equal number of control subjects were then recruited from random-digit dial procedure. 5 cases had been exposed, compared to only 6 controls. How much more likely were cases to report an exposure than controls? - Correct Answers ✅0.81 times as likely A study of 78 cases of disease X were identified from a state registry. A total of 120 control subjects were then recruited from random-digit dial procedure. 6 cases had been exposed, compared to only 3 controls. How much more likely were cases to report an exposure than controls? - Correct Answers ✅3.25 times more likely The systematic and continuous gathering of information about the occurrence of diseases and other health
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