{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T00:26:34Z","timestamp":1747182394762,"version":"3.40.5"},"reference-count":41,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2022,6,1]],"date-time":"2022-06-01T00:00:00Z","timestamp":1654041600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100005416","name":"Norges Forskningsr\u00e5d","doi-asserted-by":"publisher","award":["#262700","#320656"],"award-info":[{"award-number":["#262700","#320656"]}],"id":[{"id":"10.13039\/501100005416","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["BJOG"],"published-print":{"date-parts":[[2022,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To investigate whether intervening miscarriages and induced abortions impact the associations between interpregnancy interval after a live birth and adverse pregnancy outcomes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design<\/jats:title><jats:p>Population\u2010based cohort study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting<\/jats:title><jats:p>Norway.<\/jats:p><\/jats:sec><jats:sec><jats:title>Participants<\/jats:title><jats:p>A total of 165\u2009617 births to 143\u2009916 women between 2008 and 2016.<\/jats:p><\/jats:sec><jats:sec><jats:title>Main outcome measures<\/jats:title><jats:p>We estimated adjusted relative risks for adverse pregnancy outcomes using log\u2010binomial regression, first ignoring miscarriages and induced abortions in the interpregnancy interval estimation (<jats:italic>conventional interpregnancy interval estimates<\/jats:italic>) and subsequently accounting for intervening miscarriages or induced abortions (<jats:italic>correct interpregnancy interval estimates<\/jats:italic>). We then calculated the ratio of the two relative risks (ratio of ratios, RoR) as a measure of the difference.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The proportion of short interpregnancy interval (&lt;6\u00a0months) was 4.0% in the conventional interpregnancy interval estimate and slightly increased to 4.6% in the correct interpregnancy interval estimate. For interpregnancy interval\u2009&lt;6\u00a0months, compared with 18\u201323\u2009months, the RoR was 0.97 for preterm birth (PTB) (95% confidence interval [CI] 0.83\u20131.13), 0.97 for spontaneous PTB ( 95% CI 0.80\u20131.19), 1.00 for small\u2010for\u2010gestational age ( 95% CI 0.86\u20131.14), 1.00 for large\u2010for\u2010gestational age (95% CI 0.90\u20131.10) and 0.99 for pre\u2010eclampsia (95% CI 0.71\u20131.37). Similarly, conventional and correct interpregnancy intervals yielded associations of similar magnitude between long interpregnancy interval (\u226560\u2009months) and the pregnancy outcomes evaluated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Not considering intervening pregnancy loss due to miscarriages or induced abortions, results in negligible difference in the associations between short and long interpregnancy intervals and adverse pregnancy outcomes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Tweetable abstract<\/jats:title><jats:p>Not considering pregnancy loss in interpregnancy interval estimation resulted no meaningful differences in observed risks of adverse pregnancy outcomes.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1471-0528.17223","type":"journal-article","created":{"date-parts":[[2022,5,21]],"date-time":"2022-05-21T04:08:50Z","timestamp":1653106130000},"page":"1853-1861","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["The role of intervening pregnancy loss in the association between interpregnancy interval and adverse pregnancy outcomes"],"prefix":"10.1111","volume":"129","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4784-8151","authenticated-orcid":false,"given":"Gizachew A.","family":"Tessema","sequence":"first","affiliation":[{"name":"Curtin School of Population Health Curtin University  Perth Western Australia Australia"},{"name":"School of Public Health University of Adelaide  Adelaide South Australia Australia"},{"name":"Centre for Fertility and Health Norwegian Institute of Public Health  Oslo 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