In a randomized controlled trial of analgesia after total joint replacement surgery, the median difference between treatment groups in the 0-10 numeric rating scale of pain intensity on postoperative day 2 was 2.2 (95% confidence interval [CI], 1.1-3.5; p=0.01). Which one of the following reasons best summarizes why the p value or Cl is preferred?
A. The p value is preferred because it provides an estimate of the magnitude of the observed difference.
B. The Cl is preferred because it provides an estimate of the magnitude of difference.
C. The p value is preferred because it provides the insight needed for clinical decision-making.
D. The Cl is preferred because it provides the insight needed for clinical decision-making.