A study shows that the participants who received 6 months of a new oral anticoagulant after a venous thromboembolism were randomized to continue with the new oral anticoagulant (n =
612) or to placebo (n = 611) for 18 months. Thromboembolism recurred in 12 subjects in the new oral anticoagulant group and 71 subjects in the placebo group (hazard ratio 0.17; 95% CI, 0.09-
0.30; p < 0.001).
Which of the following statements regarding these results is correct?