ATI RN
Questions in Epidemiology Questions
Question 1 of 5
Which type of study design is best suited for studying the prevalence of a disease?
Correct Answer: C
Rationale: Cross-sectional studies (C) measure prevalence (e.g., diabetes rates). A and B focus on associations, D on interventions.
Question 2 of 5
Which of the following is an example of selection bias?
Correct Answer: A
Rationale: Loss to follow-up (A) is selection bias if related to exposure-outcome (e.g., sicker patients leaving). B, C, and D are information biases.
Question 3 of 5
Specificity of a diagnostic test is defined as:
Correct Answer: B
Rationale: Specificity (B) is true negatives / (true negatives + false positives), ruling out non-diseased (e.g., 95% specificity = 95% healthy identified). A is sensitivity, C is NPV, D is an error.
Question 4 of 5
What does a likelihood ratio of less than 1 indicate?
Correct Answer: B
Rationale: LR < 1 (B) means a result favors non-disease (e.g., LR- = (1-sensitivity) / specificity). A, C, and D misinterpret.
Question 5 of 5
The main objective of primary prevention is to:
Correct Answer: B
Rationale: Primary prevention (B) stops risk factors (e.g., anti-smoking laws). A is treatment, C is secondary, D is tertiary.