The purpose of this study was to test the feasibility and usefulness of the International Classification of @entity2794 , third edition, beta version (ICHD-3b), and compare the differences with the International Classification of @entity2794 , second edition (ICHD-2). Consecutive first-visit @entity1 were recruited from 11 @entity10 clinics in Korea. @entity10 classification was performed in accordance with ICHD-3b. The characteristics of @entity10 were analyzed and the feasibility and usefulness of this version was assessed by the proportion of unclassified @entity2794 compared with ICHD-2. A total of 1,627 @entity1 were enrolled (mean age, 47.4  14.7 yr; 62.8% female). Classification by ICHD-3b was achieved in 97.8% of @entity10 @entity1 , whereas 90.0% could be classified by ICHD-2. Primary @entity10 (n=1,429, 87.8%) were classified as follows: 697 @entity2704 , 445 @entity2701 , 22 @entity2686 , and 265 other @entity12967 . Secondary @entity10 or @entity10 /other facial @entity158 were diagnosed in 163 @entity1 (10.0%). Only 2.2% were not classified by ICHD-3b. The main reasons for missing classifications were insufficient information (1.6%) or absence of suitable classification (0.6%). The diagnoses differed from those using ICHD-2 in 243 @entity1 (14.9%). Among them, 165 @entity1 were newly classified from unclassified with ICHD-2 because of the relaxation of the previous strict criteria or the introduction of a new diagnostic category. ICHD-3b would yield a higher classification rate than its previous version, ICHD-2. ICHD-3b is applicable in clinical practice for first-visit @entity10 @entity1 of a referral hospital.

Comprehensive Application of the International Classification of XXXX Third Edition, Beta Version.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity12967 :: ('MESH:D051270', 'Disease') :: ['primary headache disorders'] @entity2686 :: ('MESH:D003027', 'Disease') :: ['cluster headaches'] @entity2704 :: ('MESH:D008881', 'Disease') :: ['migraines'] @entity2794 :: ('MESH:D020773', 'Disease') :: ['Headache Disorders', 'headache disorders'] @entity158 :: ('MESH:D010146', 'Disease') :: ['pains'] @entity2701 :: ('MESH:D018781', 'Disease') :: ['tension-type headaches'] @entity10 :: ('MESH:D006261', 'Disease') :: ['painful cranial neuropathies', 'headache', 'headaches', 'Headache']
@entity2794 :: (MESH:D020773,Disease) :: ['Headache Disorders']
