{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T20:06:44Z","timestamp":1787170004471,"version":"build-2736575974"},"reference-count":27,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2013,5,9]],"date-time":"2013-05-09T00:00:00Z","timestamp":1368057600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"New Zealand Dental Association Research Foundation"},{"DOI":"10.13039\/100008247","name":"University of Otago","doi-asserted-by":"crossref","award":["DE-015260-01A1"],"award-info":[{"award-number":["DE-015260-01A1"]}],"id":[{"id":"10.13039\/100008247","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/100000072","name":"National Institute of Dental and Craniofacial Research","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100000072","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100001505","name":"New Zealand Health Research Council","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100001505","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Clinic Periodontology"],"published-print":{"date-parts":[[2013,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Aim<\/jats:title>\n                    <jats:p>\n                      To describe changes in the occurrence of periodontal attachment loss (\n                      <jats:styled-content style=\"fixed-case\">AL<\/jats:styled-content>\n                      ) through ages 26, 32 and 38 in a complete birth cohort.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and Methods<\/jats:title>\n                    <jats:p>\n                      Systematic periodontal examinations conducted at ages 26, 32 and 38 in a longstanding New Zealand cohort study (\n                      <jats:italic>N<\/jats:italic>\n                      \u00a0=\u00a01037). Periodontitis extent data were used to assign participants to periodontitis trajectories using group\u2010based trajectory analysis.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Eight hundred and thirty\u2010one individuals were periodontally examined at all three ages; the prevalence and extent of AL increased as the cohort aged. Between 26 and 32, one in nine participants had 1+ sites showing new or progressing AL; that proportion almost doubled between ages 32 and 38. Four periodontitis trajectory groups were identified, comprising 55.2%, 31.5%, 10.7% and 2.5% of the cohort; these were termed the \u201cVery low\u201d, \u201cLow\u201d, \u201cModerately increasing\u201d and \u201cMarkedly increasing\u201d trajectory groups respectively. Those who had smoked tobacco at all ages from 15 through 38 were at higher risk of being in the \u201cModerately increasing\u201d or \u201cMarkedly increasing\u201d trajectory groups. There was a similar risk gradient for those who were in the highest 20% of cannabis usage.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Periodontitis commences relatively early in adulthood, and its progression accelerates with age, particularly among smokers.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jcpe.12108","type":"journal-article","created":{"date-parts":[[2013,5,9]],"date-time":"2013-05-09T04:29:04Z","timestamp":1368073744000},"page":"672-680","source":"Crossref","is-referenced-by-count":52,"title":["The natural history of periodontal attachment loss during the third and fourth decades of life"],"prefix":"10.1111","volume":"40","author":[{"given":"W. Murray","family":"Thomson","sequence":"first","affiliation":[{"name":"Sir John Walsh Research Institute Faculty of Dentistry The University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dara M.","family":"Shearer","sequence":"additional","affiliation":[{"name":"Sir John Walsh Research Institute Faculty of Dentistry The University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan M.","family":"Broadbent","sequence":"additional","affiliation":[{"name":"Sir John Walsh Research Institute Faculty of Dentistry The University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lyndie A.","family":"Foster Page","sequence":"additional","affiliation":[{"name":"Sir John Walsh Research Institute Faculty of Dentistry The University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richie","family":"Poulton","sequence":"additional","affiliation":[{"name":"Preventive and Social Medicine University of Otago Dunedin New Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,5,9]]},"reference":[{"key":"e_1_2_6_2_1","volume-title":"Australia's dental generations: the National Survey of Adult Oral Health 2004\u201006","author":"AIHW Dental Statistics and Research Unit","year":"2007"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0765.2006.00936.x"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.14219\/jada.archive.2011.0197"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1177\/154405910808700112"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-051X.2006.00988.x"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1834-7819.2009.01144.x"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0765.2006.00930.x"},{"issue":"3","key":"e_1_2_6_9_1","first-page":"1","article-title":"Periodontitis: from local infection to systemic diseases","volume":"18","author":"D'Aiuto F.","year":"2005","journal-title":"International Journal of Immunopathology and Pharmacology"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1177\/0022034512457373"},{"key":"e_1_2_6_11_1","first-page":"115","article-title":"The Elley\u2010Irving socio\u2010economic index 1981 Census revision","volume":"20","author":"Elley W. 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