Context.—Tension-type headache is a highly prevalent condition. Because few population-
based studies have been performed, little is known about its epidemiology. Objectives.—To
estimate the 1-year period prevalence of episodic tension-type headache (ETTH) and
chronic tension-type headache (CTTH) in a population-based study; to describe differences
in 1-year period prevalence by sex, age, education, and race; and to describe attack
frequency and headache pain intensity. Design.—Telephone survey conducted 1993 to�…