{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,5]],"date-time":"2026-07-05T02:40:43Z","timestamp":1783219243917,"version":"3.54.6"},"reference-count":20,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2024,10,22]],"date-time":"2024-10-22T00:00:00Z","timestamp":1729555200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Scand J Public Health"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:sec>\n                    <jats:title>Aims:<\/jats:title>\n                    <jats:p>Reproductive history conveys information about potential health risks later in adulthood. This study aimed to examine the validity of self-reported number of pregnancies and maternal age at first birth (AFB) among females attending BreastScreen Norway.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>\n                      Participants were identified through the Janus Serum Bank cohort in Norway and were eligible for this cross-sectional validation study if they participated in a health survey issued by BreastScreen Norway between 2006 and 2015. Retrospective self-reported survey information on number of pregnancies and AFB in years was validated against prospectively collected information from the Medical Birth Registry of Norway (MBRN) using the Spearman rank (\n                      <jats:italic toggle=\"yes\">\n                        r\n                        <jats:sub>s<\/jats:sub>\n                      <\/jats:italic>\n                      ) and intraclass correlation coefficients (ICC) with 95% confidence intervals (CI).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>\n                      After exclusions, 51,598 subjects were included in the analysis on number of pregnancies and 46,919 in the analysis on AFB. On average, study subjects were 59\u201360 years old when completing the health survey and had become first-time mothers roughly 36 years earlier. Survey-based information about number of pregnancies was highly correlated and demonstrated high agreement with the registry data (\n                      <jats:italic toggle=\"yes\">\n                        r\n                        <jats:sub>s<\/jats:sub>\n                      <\/jats:italic>\n                      =0.967, 95% CI 0.964\u20130.969; ICC=0.884, 95% CI 0.882\u20130.885). Survey-based information about AFB demonstrated even higher correlation and very high agreement with the registry data (\n                      <jats:italic toggle=\"yes\">\n                        r\n                        <jats:sub>s<\/jats:sub>\n                      <\/jats:italic>\n                      =0.975, 95% CI 0.973\u20130.976; ICC=0.974, 95% CI 0.974\u20130.975).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions:<\/jats:title>\n                    <jats:p>\n                      <jats:bold>Retrospectively recalled survey-based information about number of pregnancies and AFB was highly accurate when validated against prospectively collected information in the MBRN. These survey-based data are valuable for future epidemiological research, and linkage to the MBRN may not be required when these data are available.<\/jats:bold>\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/14034948241281197","type":"journal-article","created":{"date-parts":[[2024,10,23]],"date-time":"2024-10-23T01:45:37Z","timestamp":1729647937000},"page":"92-97","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Validity of self-reported number of pregnancies and maternal age at first birth among females attending organized mammographic screening"],"prefix":"10.1177","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8749-6237","authenticated-orcid":false,"given":"Kaitlyn M.","family":"Tsuruda","sequence":"first","affiliation":[{"name":"Cancer Registry of Norway, Norwegian Institute of Public Health, Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hilde","family":"Langseth","sequence":"additional","affiliation":[{"name":"Cancer Registry of Norway, Norwegian Institute of Public Health, Oslo, Norway"},{"name":"Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giske","family":"Ursin","sequence":"additional","affiliation":[{"name":"Cancer Registry of Norway, Norwegian Institute of Public Health, Oslo, Norway"},{"name":"Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Norway"},{"name":"Department of Preventive Medicine, University of Southern California, Los Angeles, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0178-8939","authenticated-orcid":false,"given":"Solveig","family":"Hofvind","sequence":"additional","affiliation":[{"name":"Cancer Registry of Norway, Norwegian Institute of Public Health, Oslo, Norway"},{"name":"Department of Health and Care Sciences, The Arctic University of Norway, Troms\u00f8, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. T.","family":"Fortner","sequence":"additional","affiliation":[{"name":"Cancer Registry of Norway, Norwegian Institute of Public Health, Oslo, Norway"},{"name":"Division of Cancer Epidemiology, German Cancer Research Center, Heidelberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2024,10,22]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/ijc.2910460408"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1186\/s13058-016-0798-x"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1007\/s10552-020-01284-2"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.1093\/jnci\/djaa099"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1002\/ijc.34192"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1177\/1403494817749393"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/dyw027"},{"key":"e_1_3_2_9_2","doi-asserted-by":"publisher","DOI":"10.1093\/ije\/dyw302"},{"key":"e_1_3_2_10_2","doi-asserted-by":"publisher","DOI":"10.1177\/0969141320932945"},{"key":"e_1_3_2_11_2","volume-title":"BreastScreen Norway: 25 years of organized mammographic screening","author":"Bj\u00f8rnson E","year":"2022","unstructured":"Bj\u00f8rnson E, Holen \u00c5S, Sagstad S, et al. BreastScreen Norway: 25 years of organized mammographic screening. Oslo, Norway: Cancer Registry of Norway, 2022."},{"key":"e_1_3_2_12_2","doi-asserted-by":"publisher","DOI":"10.5324\/nje.v30i1-2.4980"},{"key":"e_1_3_2_13_2","unstructured":"Cancer Registry of Norway. Research in BreastScreen Norway https:\/\/www.kreftregisteret.no\/en\/screening\/BreastScreen_Norway\/research-in-breastscreen-norway\/ (2023 accessed 13 May 2014)."},{"key":"e_1_3_2_14_2","unstructured":"Cancer Registry of Norway. Q-2006: epidemiologisk sp\u00f8rreskjema i Mammografiprogrammet [Q-2006: an epidemiological questionnaire in BreastScreen Norway] https:\/\/www.kreftregisteret.no\/screening\/mammografiprogrammet\/Hva-forsker-vi-pa\/sporreskjemaundersokelsen-q2006\/ (2024 accessed 13 May 2024)."},{"key":"e_1_3_2_15_2","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0412.2000.079006435.x"},{"key":"e_1_3_2_16_2","article-title":"Medisinsk fodselsregister \u2013 et sentralt utgangspunkt for perinatalmedisinsk forskning [Medical birth registry \u2013 an essential resource in perinatal medical research]","volume":"122","author":"Irgens LM.","year":"2002","unstructured":"Irgens LM. Medisinsk fodselsregister \u2013 et sentralt utgangspunkt for perinatalmedisinsk forskning [Medical birth registry \u2013 an essential resource in perinatal medical research]. 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