{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T20:23:24Z","timestamp":1792787004453,"version":"4.5.0"},"reference-count":32,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2014,10,17]],"date-time":"2014-10-17T00:00:00Z","timestamp":1413504000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Health Region South East Norway","award":["3013100"],"award-info":[{"award-number":["3013100"]}]}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Acta Obstet Gynecol Scand"],"published-print":{"date-parts":[[2014,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To study whether placental weight or placental weight to birthweight ratio are associated with Apgar score in the newborn 5\u00a0min after birth.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Design<\/jats:title>\n                    <jats:p>Population\u2010based registry study.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Setting<\/jats:title>\n                    <jats:p>The Medical Birth Registry of Norway.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Population<\/jats:title>\n                    <jats:p>All singleton live births during the period 1999\u20132008, a total of 522\u00a0360 births.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>The placental weight to birthweight ratios were divided into quartiles within 2\u2010week intervals of gestational age at birth, hence 25% of the pregnancies were within each group. We studied the proportion of pregnancies in the highest quartile of placental weight and placental weight to birthweight ratio according to Apgar score 5\u00a0min after birth, and estimated the odds ratio for Apgar score \u22647 if the placental weight to birthweight ratio was in the highest quartile, and used the lowest quartile as reference.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Main outcome measure<\/jats:title>\n                    <jats:p>Apgar score in the newborn 5\u00a0min after birth.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      In births after pregnancy week 29, and at every 2\u2010week gestational age interval, the mean placental weight and placental weight to birthweight ratio were higher in newborn with Apgar score \u22647 than in infants with Apgar &gt;7. The crude odds ratio of Apgar score \u22647 was 1.65 (95%\n                      <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>\n                      1.57\u20131.74), comparing the highest to the lowest quartile of placental weight to birthweight ratio. Adjustments for gestational age, birthweight, infant sex, maternal age, preeclampsia, diabetes and congenital malformations did not alter the odds ratio significantly.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Placental weight and placental weight to birthweight ratio were higher in pregnancies with infant Apgar score \u22647 compared with Apgar score &gt;7.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/aogs.12509","type":"journal-article","created":{"date-parts":[[2014,9,19]],"date-time":"2014-09-19T08:37:42Z","timestamp":1411115862000},"page":"1302-1308","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":54,"title":["Placental weight and placental weight to birthweight ratio in relation to Apgar score at birth: a population study of 522\u00a0360 singleton pregnancies"],"prefix":"10.1111","volume":"93","author":[{"given":"Anne","family":"Eskild","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynecology and Institute of Clinical Medicine University of Oslo Akershus University Hospital L\u00f8renskog Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Camilla","family":"Haavaldsen","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology and Institute of Clinical Medicine University of Oslo Akershus University Hospital L\u00f8renskog Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lars J.","family":"Vatten","sequence":"additional","affiliation":[{"name":"Department of Public Health Norwegian University of Science and Technology Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2014,10,17]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1213\/00000539-195301000-00041"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.101.1.77"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1055\/s-2007-999752"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM200102153440701"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.68.1.36"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.c4990"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/kwq373"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-3476(88)80161-6"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.319.7216.1054"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2008-2579"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1067\/mob.2001.116686"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/S1701-2163(16)32431-8"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.2011.02892.x"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0b013e318253d3df"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0412.2000.079006435.x"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ajog.2014.01.007"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1097\/AOG.0000000000000132"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1097\/01.AOG.0000247174.27979.6b"},{"issue":"595","key":"e_1_2_8_20_1","first-page":"e1","article-title":"Placenta weight and birth weight; 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