National Health Regulatory Authority Licensure Examination (NHRA Bahrain) · Clinical Medicine And Surgery

Biostatistics and evidence

7 practice questions, each with the answer and an explanation.

Practise Biostatistics and evidence now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 7 questions

  1. In a trial, 12% of control patients and 8% of treated patients had the event. What is the number needed to treat?
  2. A test gives 45 true positives, 10 false positives, 5 false negatives and 40 true negatives. What is its sensitivity?
  3. A test gives 60 true positives, 30 false positives, 20 false negatives and 70 true negatives. What is its positive predictive value?
  4. A test gives 60 true positives, 30 false positives, 20 false negatives and 70 true negatives. What is its sensitivity?
  5. A test gives 90 true positives, 20 false positives, 10 false negatives and 80 true negatives. What is its positive predictive value?
  6. A test gives 60 true positives, 30 false positives, 20 false negatives and 70 true negatives. What is its specificity?
  7. A test gives 45 true positives, 10 false positives, 5 false negatives and 40 true negatives. What is its specificity?

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