{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T06:23:57Z","timestamp":1788848637546,"version":"build-2803163510"},"reference-count":34,"publisher":"BMJ","issue":"3","license":[{"start":{"date-parts":[[2021,1,15]],"date-time":"2021-01-15T00:00:00Z","timestamp":1610668800000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/100012297","name":"Society of Family Planning","doi-asserted-by":"publisher","award":["SFPRF9-JI2"],"award-info":[{"award-number":["SFPRF9-JI2"]}],"id":[{"id":"10.13039\/100012297","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Sex Reprod Health"],"accepted":{"date-parts":[[2020,12,17]]},"published-print":{"date-parts":[[2021,7]]},"abstract":"<jats:sec>\n                  <jats:title>Introduction<\/jats:title>\n                  <jats:p>We examined parity and age among women seeking an abortion in Mexico City\u2019s public first-trimester abortion programme, Interrupcion Legal de Embarazo (ILE). We hypothesised that younger women, especially students, used abortion to prevent first births while older women used abortion to limit births.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>We used clinical data from a sample of 47\u2009462 women who had an abortion between 2007 and 2016 and classified them as nulliparous or parous according to previous births prior to the abortion. We used logistic regression to identify sociodemographic and clinical factors associated with using abortion to prevent a first birth (nulliparous) versus limiting births (parous) and calculated absolute multivariable predicted probabilities.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>Overall, 41% of abortions were in nulliparous women seeking to prevent a first birth, and 59% were in women who already had one or more children. The adjusted probability of using abortion to prevent a first birth was 80.4% (95% CI 78.3 to 82.4) for women aged 12\u201317 years and 54.3% (95%\u2009CI 51.6 to 57.0) for women aged 18\u201324 years. Adolescents (aged 12\u201317 years) who were employed or students had nearly 90% adjusted probability of using abortion to prevent a first birth (employed 87.8%, 95%\u2009CI 82.9 to 92.8; students 88.5%, 95%\u2009CI 82.9 to 94.1). At all ages, employed women and students had higher probabilities of using abortion to prevent a first birth compared with unemployed women and women who work in the home.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusion<\/jats:title>\n                  <jats:p>Legal first-trimester abortion services in Mexico can help prevent first births in adolescents, especially students.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1136\/bmjsrh-2020-200795","type":"journal-article","created":{"date-parts":[[2021,1,15]],"date-time":"2021-01-15T13:21:15Z","timestamp":1610716875000},"page":"e1.2-e6","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":7,"title":["Preventing first births among adolescents in Mexico City\u2019s public abortion programme"],"prefix":"10.1136","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8120-028X","authenticated-orcid":false,"given":"Blair G","family":"Darney","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology, Oregon Health and Science University, Portland, Oregon, USA"},{"name":"National Institute of Public Health (INSP), Center for Health Systems Research (CISS), Cuernavaca, Morelos, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5551-6133","authenticated-orcid":false,"given":"Evelyn","family":"Fuentes-Rivera","sequence":"additional","affiliation":[{"name":"National Institute of Public Health (INSP), Center for Health Systems Research (CISS), Cuernavaca, Morelos, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2080-4458","authenticated-orcid":false,"given":"Biani","family":"Saavedra-Avendano","sequence":"additional","affiliation":[{"name":"Public Administration, Centro de Investigaci\u00f3n y Docencia Econ\u00f3micas (CIDE), Mexico City, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patricio","family":"Sanhueza-Smith","sequence":"additional","affiliation":[{"name":"Salud Sexual y Reproductiva, Secretar\u00eda de Salud de la Ciudad de M\u00e9xico, Mexico City, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raffaela","family":"Schiavon","sequence":"additional","affiliation":[{"name":"Independent Consultant, Mexico City, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2021,1,15]]},"reference":[{"key":"2025090511565517000_47.3.e1-a.1","doi-asserted-by":"crossref","first-page":"843","DOI":"10.1056\/NEJMsa1506575","article-title":"Declines in unintended pregnancy in the United States, 2008\u20132011","volume":"374","author":"Finer","year":"2016","journal-title":"N Engl J Med Overseas Ed"},{"key":"2025090511565517000_47.3.e1-a.2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jadohealth.2014.09.007"},{"key":"2025090511565517000_47.3.e1-a.3","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1007\/s00038-016-0926-5","article-title":"Does adolescent motherhood affect education and labor market outcomes of mothers? 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Proyecciones de la poblaci\u00f3n de M\u00e9xico y de las entidades federativas 2016-2050. Infografia. Ciudad de M\u00e9xico, 2018."},{"key":"2025090511565517000_47.3.e1-a.9","unstructured":"Pan American Health Organization (PAHO), United Nations Population Fund, United Nations Children\u2019s Fund . Accelerating progress toward the reduction of adolescent pregnancy in Latin America and the Caribbean. Report of a technical consultation. Washington, DC, USA, 2016."},{"key":"2025090511565517000_47.3.e1-a.10","unstructured":"Consejo Nacional de Poblacion . Estrategia Nacional para La Prevenci\u00f3n del Embarazo en Adolescentes. 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