{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T06:44:36Z","timestamp":1790837076798,"version":"4.1.0"},"reference-count":0,"publisher":"Walter de Gruyter GmbH","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2014,3,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>\n                  <jats:bold>Objective:<\/jats:bold> Twin studies offer opportunities to investigate mechanisms underlying sex-associated differences in perinatal outcomes. The objective of the study was to investigate sex-related differences in perinatal complications.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Study design:<\/jats:bold> A cohort of 16,045 twin pregnancies \u2013 32,090 twins \u2013 was explored for obstetric complications, perinatal and infant mortality, and neonatal morbidities.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Results:<\/jats:bold> Twin pregnancies with a female fetus had an increased risk for preeclampsia, but otherwise there were no pregnancy complications associated with fetal sex. After birth, female-female twins had lower early neonatal and infant mortality, and lower risk for respiratory morbidities than male-male twins at all gestational ages. In unlike-sexed twin pairs, very preterm males had higher respiratory morbidity than females and, females were at higher risk for being growth restricted.<\/jats:p>\n               <jats:p>\n                  <jats:bold>Conclusion:<\/jats:bold> Male-male twins have higher respiratory morbidity and neonatal mortality than female-female twins. In unliked-sexed twin pairs, the males seem to be protected by having a female co-twin.<\/jats:p>","DOI":"10.1515\/jpm-2013-0147","type":"journal-article","created":{"date-parts":[[2013,11,12]],"date-time":"2013-11-12T20:07:53Z","timestamp":1384286873000},"page":"225-231","source":"Crossref","is-referenced-by-count":38,"title":["Impact of sex on perinatal mortality and morbidity in twins"],"prefix":"10.1515","volume":"42","author":[{"given":"Emma Elsm\u00e9n","family":"Steen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karin","family":"K\u00e4ll\u00e9n","sequence":"additional","affiliation":[{"name":"Tornblad Institute Reproductive Epidemiology Center, Lund University, Lund, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karel","family":"Mar\u0161\u00e1l","sequence":"additional","affiliation":[{"name":"Department of Clinical Sciences, Lund University, Lund, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mikael","family":"Norman","sequence":"additional","affiliation":[{"name":"Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lena","family":"Hellstr\u00f6m-Westas","sequence":"additional","affiliation":[{"name":"Department of Women\u2019s and Children\u2019s Health, Uppsala University, Uppsala, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"374","published-online":{"date-parts":[[2013,11,12]]},"container-title":["Journal of Perinatal Medicine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.degruyter.com\/document\/doi\/10.1515\/jpm-2013-0147\/xml","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/www.degruyter.com\/document\/doi\/10.1515\/jpm-2013-0147\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,3,14]],"date-time":"2023-03-14T03:25:28Z","timestamp":1678764328000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.degruyter.com\/document\/doi\/10.1515\/jpm-2013-0147\/html"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2013,11,12]]},"references-count":0,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2013,11,21]]},"published-print":{"date-parts":[[2014,3,1]]}},"alternative-id":["10.1515\/jpm-2013-0147"],"URL":"https:\/\/doi.org\/10.1515\/jpm-2013-0147","relation":{},"ISSN":["1619-3997","0300-5577"],"issn-type":[{"value":"1619-3997","type":"electronic"},{"value":"0300-5577","type":"print"}],"subject":[],"published":{"date-parts":[[2013,11,12]]}}}