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This study included 2,366,559 women aged 10\u201324\u00a0years who had singleton pregnancies between 2012 and 2019 at 438 hospitals. Adolescent pregnancy was defined as younger than 20\u00a0years of age. We used multivariable logistic regression to estimate the effects. Women aged 20\u201324\u00a0years served as the reference group in all analyses. The proportion of rural girls with adolescent pregnancies rebounded after 2015 even though common-law marriage in rural areas decreased. Higher risks of eclampsia (adjusted odds ratio (aOR) 1.87, 95% confidence interval (CI) 1.57\u2009~\u20092.23), severe anaemia (aOR 1.18, 95% CI 1.09\u2009~\u20091.28), maternal near miss (MNM; aOR 1.24, 95% CI 1.12\u2009~\u20091.37), and small for gestational age (SGA; aOR 1.30, 95% CI 1.28\u2009~\u20091.33) were observed when gestational age was\u2009&gt;\u200937\u00a0weeks. Adolescent pregnancy was independently associated with increased risks of other perinatal outcomes. Further implementation of pregnancy prevention strategies and improved health care interventions are needed to reduce adolescent pregnancies and prevent adverse fertility outcomes among adolescent women in China at a time when adolescent fertility rate is rebounding.<\/jats:p>","DOI":"10.1038\/s41598-021-92037-x","type":"journal-article","created":{"date-parts":[[2021,6,15]],"date-time":"2021-06-15T10:04:25Z","timestamp":1623751465000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Characteristics and adverse outcomes of Chinese adolescent pregnancies between 2012 and 2019"],"prefix":"10.1038","volume":"11","author":[{"given":"Yanxia","family":"Xie","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaodong","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yi","family":"Mu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zheng","family":"Liu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yanping","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaohong","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Li","family":"Dai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qi","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mingrong","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peiran","family":"Chen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Juan","family":"Liang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,6,15]]},"reference":[{"key":"92037_CR1","doi-asserted-by":"publisher","first-page":"1589","DOI":"10.1111\/1471-0528.13782","volume":"123","author":"W Johnson","year":"2016","unstructured":"Johnson, W. & Moore, S. 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