{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T13:58:08Z","timestamp":1789480688184,"version":"build-2803163510"},"reference-count":24,"publisher":"Cambridge University Press (CUP)","issue":"5","license":[{"start":{"date-parts":[[2017,9,4]],"date-time":"2017-09-04T00:00:00Z","timestamp":1504483200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Twin Res Hum Genet"],"published-print":{"date-parts":[[2017,10]]},"abstract":"<jats:p>The association between birth weight and later life outcomes is of considerable interest in life-course epidemiology. Research often relies on self-reported measures of birth weight, and its validity is consequently of importance. We assessed agreement between self-reported birth weight and official birth records for Norwegian twins born 1967\u20131974. The intraclass correlation between self-reported birth weight and register-based birth weight was 0.91 in our final sample of 363 twins. It could be expected that 95% of self-reported birth-weight values will deviate from official records within a maximum of +446 grams and a minimum of \u2212478 grams \u2014 around a mean deviation of 16 grams. Self-reported birth weight had a sensitivity of 0.78\u20130.89 and a positive predictive value of 0.59\u20130.85, and an overall weighted kappa of 0.71. We further assessed agreement by conducting two linear regression models where we respectively regressed self-reported birth weight and register-based birth weight on adult body mass index, a known association. The two models were not significantly different; however, there were different levels of significance in parameter estimates that warrant some caution in using self-reported birth weight. Reliability of self-reported birth weight was also assessed, based on self-reports in another sample of twins born 1935\u20131960 who had reported their birth weight in two questionnaires 34 years apart. The intraclass correlation was 0.86, which indicates a high degree of reliability. In conclusion, self-reported birth weight, depending on context and age when birth weight was reported, can be cautiously used.<\/jats:p>","DOI":"10.1017\/thg.2017.44","type":"journal-article","created":{"date-parts":[[2017,9,4]],"date-time":"2017-09-04T05:24:06Z","timestamp":1504502646000},"page":"406-413","source":"Crossref","is-referenced-by-count":27,"title":["Validity of Self-Reported Birth Weight: Results from a Norwegian Twin Sample"],"prefix":"10.1017","volume":"20","author":[{"given":"Thomas S.","family":"Nilsen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia","family":"Kutschke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ingunn","family":"Brandt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer R.","family":"Harris","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2017,9,4]]},"reference":[{"key":"S1832427417000445_ref005","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(86)90837-8"},{"key":"S1832427417000445_ref003","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/31.6.1235"},{"key":"S1832427417000445_ref008","doi-asserted-by":"publisher","DOI":"10.1017\/S2040174410000012"},{"key":"S1832427417000445_ref024","doi-asserted-by":"publisher","DOI":"10.1017\/S0033291712000682"},{"key":"S1832427417000445_ref012","doi-asserted-by":"publisher","DOI":"10.1037\/1082-989X.1.1.30"},{"key":"S1832427417000445_ref001","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/155.4.379"},{"key":"S1832427417000445_ref017","doi-asserted-by":"publisher","DOI":"10.1258\/shorts.2012.012048"},{"key":"S1832427417000445_ref002","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/152.7.609"},{"key":"S1832427417000445_ref020","volume-title":"Stata statistical software: Release 14","year":"2015"},{"key":"S1832427417000445_ref013","first-page":"19","article-title":"The Norwegian twin registry","volume":"26","author":"Nilsen","year":"2016","journal-title":"Norwegian Journal of Epidemiology"},{"key":"S1832427417000445_ref022","volume-title":"Statistical methods in clinical and epidemiological research","author":"Veier\u00f8d","year":"2012"},{"key":"S1832427417000445_ref004","doi-asserted-by":"publisher","DOI":"10.1136\/gut.2006.097287"},{"key":"S1832427417000445_ref016","doi-asserted-by":"publisher","DOI":"10.1023\/A:1007411613576"},{"key":"S1832427417000445_ref011","doi-asserted-by":"publisher","DOI":"10.1375\/twin.4.5.321"},{"key":"S1832427417000445_ref021","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kwp205"},{"key":"S1832427417000445_ref006","doi-asserted-by":"publisher","DOI":"10.1375\/twin.5.4.308"},{"key":"S1832427417000445_ref019","doi-asserted-by":"publisher","DOI":"10.1016\/j.canep.2014.07.004"},{"key":"S1832427417000445_ref007","doi-asserted-by":"publisher","DOI":"10.1002\/ijc.29866"},{"key":"S1832427417000445_ref010","first-page":"93","article-title":"Social factors and health: Description of a new Norwegian twin study","volume":"26","author":"Kutschke","year":"2016","journal-title":"Norwegian Journal of Epidemiology"},{"key":"S1832427417000445_ref018","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.315.7116.1137"},{"key":"S1832427417000445_ref009","doi-asserted-by":"publisher","DOI":"10.1136\/jech.54.8.639"},{"key":"S1832427417000445_ref023","doi-asserted-by":"publisher","DOI":"10.3109\/00016349.2010.500370"},{"key":"S1832427417000445_ref015","doi-asserted-by":"publisher","DOI":"10.1016\/j.tics.2012.04.005"},{"key":"S1832427417000445_ref014","doi-asserted-by":"publisher","DOI":"10.1017\/thg.2012.57"}],"container-title":["Twin Research and Human Genetics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S1832427417000445","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,4,16]],"date-time":"2019-04-16T18:31:09Z","timestamp":1555439469000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.cambridge.org\/core\/product\/identifier\/S1832427417000445\/type\/journal_article"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,9,4]]},"references-count":24,"journal-issue":{"issue":"5","published-print":{"date-parts":[[2017,10]]}},"alternative-id":["S1832427417000445"],"URL":"https:\/\/doi.org\/10.1017\/thg.2017.44","relation":{},"ISSN":["1832-4274","1839-2628"],"issn-type":[{"value":"1832-4274","type":"print"},{"value":"1839-2628","type":"electronic"}],"subject":[],"published":{"date-parts":[[2017,9,4]]}}}