A pharmaceutical trial revealed that patients receiving Drug Z reported a 40% reduction in migraine frequency. However, 38% of patients receiving an inert placebo reported an identical reduction in migraine frequency. What is the most reasonable inference from these findings?

Answer and explanation

Correct answer: C. Drug Z's therapeutic effect is not significantly greater than the placebo response.

  1. Step 1: Drug Z group: 40% reduction. Placebo group: 38% reduction.
  2. Step 2: The difference between the drug and placebo response is only 2 percentage points, which is clinically and statistically negligible.
  3. Step 3: The primary inference is that Drug Z does not demonstrate efficacy beyond the placebo effect.
Answer
Drug Z's therapeutic effect is not significantly greater than the placebo response.
Why not the others: Placebos showed a 38% reduction in migraines, indicating benefit rather than harm; approving Drug Z as frontline treatment is unjustified without demonstrated superiority; psychological factors clearly influenced symptoms given the 38% response.

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