{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T19:20:05Z","timestamp":1777490405106,"version":"3.51.4"},"reference-count":30,"publisher":"SAGE Publications","issue":"8","license":[{"start":{"date-parts":[[2025,8,1]],"date-time":"2025-08-01T00:00:00Z","timestamp":1754006400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,8,1]],"date-time":"2025-08-01T00:00:00Z","timestamp":1754006400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"DOI":"10.13039\/501100001826","name":"ZonMw","doi-asserted-by":"publisher","award":["10960102310009"],"award-info":[{"award-number":["10960102310009"]}],"id":[{"id":"10.13039\/501100001826","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Cephalalgia"],"published-print":{"date-parts":[[2025,8]]},"abstract":"<jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To evaluate the psychometric characteristics of a previously validated electronic headache diary with automated algorithm for the purpose of identifying migraine days.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>The psychometric properties of 13 variables in this e-diary were analyzed using item response theory (IRT) in migraine patients from the Leiden Headache Center. The included items were headache presence, duration, unilaterality, severity, pulsating, aggravation by physical activity, visual aura, aura duration, nausea, vomiting, photophobia or phonophobia and triptan usage. The added value to the end-diagnosis of an already validated migraine day of the individual items was assessed. A generalized partial credit model was used to evaluate the items. A discriminative value \u03b1\u2009\u2265\u20091.70 indicated an excellent discrimination.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>In total 1418 migraine patients were analyzed with a mean age of 43 years, 89% were women and 38% reported aura symptomatology. All items demonstrated excellent discriminative value [\u03b1: 1.82\u201354.1], except for aura duration [\u03b1:0.86], which was moderate. Cronbach's alpha was 0.91. The answers options of headache duration, photophobia, phonophobia, nausea and vomiting did not reach the probability threshold of 0.5.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The items in this e-headache diary demonstrated good overall psychometric performance, although certain items, particularly aura-related and multi-categorical items, may benefit from category merging or further refinement.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/03331024251359222","type":"journal-article","created":{"date-parts":[[2025,8,4]],"date-time":"2025-08-04T05:31:59Z","timestamp":1754285519000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["The psychometric properties of an e-headache diary in migraine"],"prefix":"10.1177","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3558-8065","authenticated-orcid":false,"given":"Nancy","family":"van Veelen","sequence":"first","affiliation":[{"name":"Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1763-5443","authenticated-orcid":false,"given":"Nadine","family":"Pelzer","sequence":"additional","affiliation":[{"name":"Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands"},{"name":"Health Campus The Hague, Department of Public Health &amp; Primary Care, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8999-0087","authenticated-orcid":false,"given":"Britt W.H.","family":"van der Arend","sequence":"additional","affiliation":[{"name":"Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands"},{"name":"Department of Internal Medicine, Erasmus MC, Rotterdam, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-0020-7507","authenticated-orcid":false,"given":"Natasha","family":"Waslam","sequence":"additional","affiliation":[{"name":"Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daphne S.","family":"van Casteren","sequence":"additional","affiliation":[{"name":"Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8874-2292","authenticated-orcid":false,"given":"Erik J.","family":"Giltay","sequence":"additional","affiliation":[{"name":"Health Campus The Hague, Department of Public Health &amp; Primary Care, Leiden University Medical Center, Leiden, The Netherlands"},{"name":"Department of Psychiatry, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gisela M.","family":"Terwindt","sequence":"additional","affiliation":[{"name":"Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2025,8,3]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1177\/03331024211010306"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1177\/03331024231166625"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1001\/jama.2021.1640"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1111\/ene.15075"},{"key":"e_1_3_2_6_2","unstructured":"Zorginstituut Nederland. Medicijnen met CGRP-remmers bij chronische migraine onder voorwaarden in basispakket. 2021."},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1186\/s12911-022-01813-w"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1089\/tmj.2024.0105"},{"key":"e_1_3_2_9_2","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.0000000000207964"},{"key":"e_1_3_2_10_2","doi-asserted-by":"publisher","DOI":"10.1177\/0333102420949180"},{"key":"e_1_3_2_11_2","doi-asserted-by":"publisher","DOI":"10.1212\/01.WNL.0000052998.58526.A9"},{"key":"e_1_3_2_12_2","doi-asserted-by":"publisher","DOI":"10.3390\/toxins11110668"},{"key":"e_1_3_2_13_2","doi-asserted-by":"publisher","DOI":"10.1177\/0333102416660549"},{"key":"e_1_3_2_14_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1526-4610.2007.00783.x"},{"key":"e_1_3_2_15_2","doi-asserted-by":"publisher","DOI":"10.3390\/diagnostics14010021"},{"key":"e_1_3_2_16_2","doi-asserted-by":"publisher","DOI":"10.1186\/s10194-020-01139-w"},{"key":"e_1_3_2_17_2","doi-asserted-by":"publisher","DOI":"10.1007\/s40271-013-0041-0"},{"key":"e_1_3_2_18_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jval.2014.10.005"},{"key":"e_1_3_2_19_2","doi-asserted-by":"publisher","DOI":"10.1177\/03331024221099031"},{"key":"e_1_3_2_20_2","doi-asserted-by":"publisher","DOI":"10.1002\/mds.28110"},{"key":"e_1_3_2_21_2","doi-asserted-by":"publisher","DOI":"10.1177\/0333102411418846"},{"key":"e_1_3_2_22_2","doi-asserted-by":"publisher","DOI":"10.1177\/03331024231198792"},{"key":"e_1_3_2_23_2","doi-asserted-by":"publisher","DOI":"10.1177\/0146621616677520"},{"key":"e_1_3_2_24_2","doi-asserted-by":"publisher","DOI":"10.11591\/ijere.v7i2.12900"},{"key":"e_1_3_2_25_2","first-page":"147","volume-title":"Educational measurement","author":"Hambleton RK","year":"1989","unstructured":"Hambleton RK. Principles and selected applications of item response theory. In: Educational measurement. 3rd ed. American Council on Education, 1989, pp.147\u2013200.","edition":"3"},{"key":"e_1_3_2_26_2","first-page":"31","article-title":"The international classification of headache disorders, 3rd edition (beta version)","volume":"38","author":"Headache Classification Committee of the IHS","year":"2018","unstructured":"Headache Classification Committee of the IHS. The international classification of headache disorders, 3rd edition (beta version). 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