{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T13:27:22Z","timestamp":1788355642212,"version":"build-2803163510"},"reference-count":29,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2017,4,3]],"date-time":"2017-04-03T00:00:00Z","timestamp":1491177600000},"content-version":"vor","delay-in-days":2,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Ultrasound in Obstet &amp; Gyne"],"published-print":{"date-parts":[[2017,4]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>To develop a complete, population\u2010based system for ultrasound\u2010based fetal size monitoring and birth\u2010weight prediction for use in the second and third trimesters of pregnancy.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Using 31\u2009516 ultrasound examinations from a population\u2010based Norwegian clinical database, we constructed fetal size charts for biparietal diameter, femur length and abdominal circumference from 24 to 42\u2009weeks' gestation. A reference curve of median birth weight for gestational age was estimated using 45\u2009037 birth weights. We determined how individual deviations from the expected ultrasound measures predicted individual percentage deviations from expected birth weight. The predictive quality was assessed by explained variance of birth weight and receiver\u2013operating characteristics curves for prediction of small\u2010for\u2010gestational age. A curve for intrauterine estimated fetal weight was constructed. Charts were smoothed using the\n                      <jats:italic>gamlss<\/jats:italic>\n                      non\u2010linear regression method.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The population\u2010based approach, using bias\u2010free ultrasound gestational age, produces stable estimates of size\u2010for\u2010age and weight\u2010for\u2010age curves in the range 24\u201342\u2009weeks' gestation. There is a close correspondence between percentage deviations and percentiles of birth weight by gestational age, making it easy to convert between the two. The variance of birth weight that can be \u2018explained\u2019 by ultrasound increases from 8% at 20\u2009weeks up to 67% around term. Intrauterine estimated fetal weight is 0\u2013106\u2009g higher than median birth weight in the preterm period.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The new population\u2010based birth\u2010weight prediction model provides a simple summary measure, the \u2018percentage birth\u2010weight deviation\u2019, to be used for fetal size monitoring throughout the third trimester. Predictive quality of the model can be measured directly from the population data. The model computes both median observed birth weight and intrauterine estimated fetal weight. Copyright \u00a9 2016 ISUOG. Published by John Wiley &amp; Sons Ltd.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/uog.15954","type":"journal-article","created":{"date-parts":[[2016,5,1]],"date-time":"2016-05-01T07:29:49Z","timestamp":1462087789000},"page":"500-507","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Fetal size monitoring and birth\u2010weight prediction: a new population\u2010based approach"],"prefix":"10.1002","volume":"49","author":[{"given":"H. 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