{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,7]],"date-time":"2026-07-07T15:17:12Z","timestamp":1783437432264,"version":"3.54.6"},"reference-count":34,"publisher":"Walter de Gruyter GmbH","issue":"6","license":[{"start":{"date-parts":[[2026,5,25]],"date-time":"2026-05-25T00:00:00Z","timestamp":1779667200000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,7,24]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec id=\"j_jpm-2025-0720_abs_001\">\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>The long-term impact of the COVID-19 pandemic on perinatal outcomes remains understudied in South Korea. We aimed to evaluate nationwide changes in neonatal birth outcomes following pandemic\u00a0onset.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"j_jpm-2025-0720_abs_002\">\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>All live births between 2016 and 2023 were analyzed, sourced from Statistics Korea. Bayesian structural time series modeling was used to compare perinatal outcomes after March 2020 with projected trends, adjusting for time-varying sociodemographic covariates and seasonality.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"j_jpm-2025-0720_abs_003\">\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Overall, 2,347,662 births were included in the analysis (1,413,409\u00a0pre-pandemic and 934,253 post-pandemic). After pandemic onset, the proportion of mothers aged\u00a0\u226535\u00a0years and preterm births increased, whereas mean gestational age and birth weight decreased. Bayesian modeling revealed that mean gestational age and birth weight were significantly lower than counterfactual projections. Preterm and extremely preterm births increased by 9.3\u202f% and 15\u202f%, respectively. Mean birth weight z-scores were lower than projected, and the proportion of large-for-gestational-age infants decreased by 10\u202f%.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"j_jpm-2025-0720_abs_004\">\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>These findings suggest that the COVID-19 pandemic has had a sustained and long-term impact on perinatal characteristics at the population-level. Beyond the biological effects of COVID-19 infection, the pandemic may have functioned as a broader social determinant of perinatal health, amplifying existing socioeconomic inequalities and contributing to persistent increases in preterm\u00a0birth.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1515\/jpm-2025-0720","type":"journal-article","created":{"date-parts":[[2026,5,23]],"date-time":"2026-05-23T06:18:57Z","timestamp":1779517137000},"page":"994-1003","source":"Crossref","is-referenced-by-count":0,"title":["Post-pandemic structural shifts in perinatal characteristics and outcomes"],"prefix":"10.1515","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-3303-2912","authenticated-orcid":false,"given":"Taewoo","family":"Shin","sequence":"first","affiliation":[{"name":"Department of Pediatrics , Yonsei University Wonju College of Medicine , Wonju , Gangwon-do , Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-7004-1452","authenticated-orcid":false,"given":"Eun Jung","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Pediatrics , Yonsei University Wonju College of Medicine , Wonju , Gangwon-do , Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0089-0069","authenticated-orcid":false,"given":"Hunju","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Preventive Medicine , Yonsei University Wonju College of Medicine , Wonju , Gangwon-do , Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2040-389X","authenticated-orcid":false,"given":"Hyowon","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Preventive Medicine , Yonsei University Wonju College of Medicine , Wonju , Gangwon-do , Republic of Korea"},{"name":"Department of Pediatrics , Ajou University School of Medicine , Suwon , Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9429-8474","authenticated-orcid":false,"given":"Yeong Myong","family":"Yoo","sequence":"additional","affiliation":[{"name":"Department of Pediatrics , Yonsei University Wonju College of Medicine , Wonju , Gangwon-do , Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"374","published-online":{"date-parts":[[2026,5,25]]},"reference":[{"key":"2026070714574611389_j_jpm-2025-0720_ref_001","unstructured":"World Health Organization. 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