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- W1978332018 abstract "The aim of this study is to establish a chart for pregnancy dating by CRL measurements in the first trimester and to compare our model with main conventional models. A retrospective cross-sectional study of CRL measurements of pregnancies examined between 5 + 0 and 15 + 5 weeks in our facility over an 8-year period. Exclusion criteria included positive combined screening, fetal chromosomal or organ anomaly, subsequent spontaneous abortion and maternal diabetes mellitus. The principles of data analysis were based on polynomial regression fitted separately to the mean and to the standard deviation (SD) as a function of gestational age (GA) described by Altman (1993). We checked Normality distribution and goodness of fit of our model. We calculated 95% prediction interval (PI) and compared our model with main conventional models. 10 131 CRL measurements were eligible for the designed study. The range of CRL merged from 1 mm to 99 mm. The best-fit curve for the relation CRL (mm) to GA (days) was achieved by cubic function y = 0,0000423 x3− 0,01232 x2 + 1,3933 x + 39,2149 (SD = − 0, 02272 x + 5,04917). Mean 95% PI was ± 8 days. Differences of the actual GA for our CRL values with the predicted GA from appropriate dating model were calculated and expressed as mean difference and difference for CRL of 1 mm and 84 mm. Plotting all differences into graph linear regression lines were constructed and their slopes calculated to assess the extent of agreement between our data and the appropriate model. For results see table below. Almost absolute agreement was observed with Wisser model. We propose new chart for dating pregnancy in the first trimester with 95% PI ± 8 days. Almost absolute agreement was observed with Wisser dating model. P02.09: Table" @default.
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- W1978332018 date "2009-09-01" @default.
- W1978332018 modified "2023-10-16" @default.
- W1978332018 title "P02.09: New chart for ultrasound dating of pregnancy in the first trimester based on a large sample of Czech population" @default.
- W1978332018 doi "https://doi.org/10.1002/uog.7033" @default.
- W1978332018 hasPublicationYear "2009" @default.
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