hard · MCAT

In a clinical trial for a novel diuretic, researchers report a statistically significant reduction in systolic blood pressure (p < 0.05) across a sample of 15,000 participants. However, the mean reduction was only 1.2 mmHg.

How should a clinician interpret these findings regarding clinical significance?

  1. Clinical significance is guaranteed whenever the null hypothesis is rejected at the α = 0.05 level.
  2. The p-value indicates a 95% probability that the drug will successfully treat hypertension in any given patient.
  3. The drug is clinically significant because the large sample size ensures high statistical power.
  4. The result is statistically significant but likely lacks clinical significance due to the small effect size.

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