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Analysis of variance, correlation, and regression analysis using fractional polynomials and 7 independent variables (head circumference, biparietal diameter, abdominal circumference, femur length, estimated fetal weight, mean ultrasound gestational age, and last menstrual period gestational age) were performed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The correlation between the mean ultrasound gestational age and last menstrual period gestational age was 0.9880 (5% confidence limit, 0.9716; 95% confidence limit, 0.9880), with an <jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> of 0.9762. The <jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> value for the 7 independent variables regressed against the area and circumference using the point\u2010to\u2010point trace and electronic ellipse methods ranged between 0.885 and 0.965. Comparison of <jats:italic>Z<\/jats:italic> scores between this study and previous publications demonstrated that there were differences and similarities, depending on whether the area or circumference was measured.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This study shows high <jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup> values when comparing measurements of the area and circumference against 7 independent variables, irrespective of whether the point\u2010to\u2010point trace or the electronic ellipse method was used to obtain the measurements. A calculator to evaluate the area and circumference is provided, using 7 independent variables from which <jats:italic>Z<\/jats:italic> scores and percentiles for individual measurements can be computed.<\/jats:p><\/jats:sec>","DOI":"10.7863\/ultra.16.02019","type":"journal-article","created":{"date-parts":[[2016,10,14]],"date-time":"2016-10-14T03:05:09Z","timestamp":1476414309000},"page":"2543-2562","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Fetal Heart Size"],"prefix":"10.1002","volume":"35","author":[{"given":"Greggory 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