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Question 1
In a cohort study investigating the association between occupational pesticide exposure and neurodegenerative disease, the crude relative risk is 2.8. When stratified by age (=50 years), the relative risk is 1.4 in the younger group and 1.4 in the older group. Which of the following best explains this phenomenon?
Correct Answer:
Age acts as a confounder in this association.
Question 2
A hospital-based case-control study explores the association between chronic coffee consumption and peptic ulcer disease. Patients admitted for gastrointestinal bleeding are chosen as cases, while patients admitted for orthopedic trauma serve as controls. The observed odds ratio is distorted because coffee consumption and peptic ulcers both increase the probability of hospital admission. What specific epidemiological bias is demonstrated?
Correct Answer:
Berkson's bias (admission rate bias)
Question 3
In an observational cohort study evaluating survival among patients with heart failure who receive implantable cardioverter-defibrillators (ICDs), person-time is counted from the time of diagnosis, but ICD implantation occurs at variable intervals months later. Counting the pre-implantation observation time as 'exposed' person-time would introduce which methodological error?
Correct Answer:
Immortal time bias
Question 4
In directed acyclic graph (DAG) causal methodology, conditioning (adjusting or stratifying) on a variable that is independently caused by both the exposure and the outcome results in which of the following biases?
Correct Answer:
Collider stratification bias
Question 5
During a point-source gastroenteritis outbreak following a communal wedding dinner attended by 500 guests, 120 guests develop acute watery diarrhea within 36 hours. What is the overall attack rate in this cohort?
Correct Answer:
24%
Question 1
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About this Exam

Prepare with the Arab Board Community Medicine Final Written Practice Questions - Arab Board of Health Specializations (ABHS) Community Medicine Final Written Examination Exam practice quiz. This question bank includes 100 questions covering health, years, patients, mortality, and national. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Arab Board Community Medicine Final Written Practice Questions - Arab Board of Health Specializations (ABHS) Community Medicine Final Written Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on health, years, patients, mortality, and national. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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