Question 32 (part 2) · LEK · Diagnostic sensitivity and specificity
1,000 elderly people with suspected dementia underwent screening and diagnostic (verification) tests. The prevalence of dementia in this population is 25%. 240 people tested positive in both screening and verification studies, and 600 people tested negative in both studies. The remaining 160 people obtained false test results. What percentage of healthy people have been falsely identified as having dementia?
- A. 2%.
- B. 4%.
- C. 20%.
- D. 38%.
- E. 62%.
Hint
Use the prevalence to split 1000 people into sick and healthy, then find the false positives within the healthy group.
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