Correction

Chronic Daily Headache

N Engl J Med 2006; 354:884February 23, 2006

Article

Chronic Daily Headache (Clinical Practice, N Engl J Med 2006:354;158 - 165) . On page 160, in Table 2, the male:female ratio for cluster headache should have read “3:1,” rather than “1:3,” as printed. Also, on page 217, in the Continuing Medical Education section, choice A under Question 1 (which was listed as an incorrect choice) should have read, “Cluster headaches are more common among women than among men,” rather than “more common among men than among women,” as printed. Likewise, the explanation that followed the choices, which appeared at www.nejm.org, should have read, “Cluster headache is more common among men,” rather than “among women,” as printed. This article and its Continuing Medical Education examination have been corrected on the Journal's Web site. We regret the errors.