ATI RN
Epidemiology Practice Questions Questions
Question 1 of 5
If a diagnostic test has a sensitivity of 90% and a specificity of 95%, what does this imply?
Correct Answer: B
Rationale: Sensitivity 90% and specificity 95% (B) mean 90% of diseased and 95% of non-diseased are correctly identified. A is true but incomplete, C and D are false (5% FPR, 10% FNR).
Question 2 of 5
What is the 'age-specific mortality rate'?
Correct Answer: B
Rationale: Age-specific mortality (B) is deaths in an age group (e.g., 65+ deaths). A is incidence, C is denominator, D is recovery.
Question 3 of 5
The incidence of nosocomial infections among patients admitted to general hospitals in the United States is about
Correct Answer: C
Rationale: CDC estimates nosocomial infections at 5-10%, with 6% a common average. A and B are too low; D and E are too high.
Question 4 of 5
Compared with Western European countries (excluding Northern Ireland), the homicide rate in the U.S. is
Correct Answer: D
Rationale: U.S. homicide rate is ~2-3x higher than Western Europe (e.g., 5 vs. 1-2 per 100,000).
Question 5 of 5
Premature loss of life can be defined as years of life lost due to a disease before the age of 65 years. The leading cause of premature loss of life in the U.S. is
Correct Answer: B
Rationale: Cancer (e.g., lung, breast) leads in years lost before 65.