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The EWMA provides a universal, easy and efficient tool for NT quality review when the prompt and effective detection of suboptimal performance is desired.

Poster abstracts different occasions (intraobserver variability) or between different examiners (interobserver variability) was calculated by using intraclass correlation coefficient (ICC) and Bland-Altman graphs. Results: It was observed high intra-and interobserver agreement with ICC > 0.90 for all 3D power Doppler indices in the ACA territory. Intraobserver reliability: VI [ICC = 0.984 (CI 95% 0.959-0.994)], FI [ICC = 0.985 (CI 95% 0.962-0.994)], VFI [ICC = 0.986 (CI 95% 0.964-0.994)]. Interobserver reliability: VI [ICC = 0.960 (CI 95% 0.899-0.984)], FI [ICC = 0.983 (CI 95% 0.958-0.993)], VFI [ICC = 0.916 (CI 95% 0.910-0.926)]. Conclusions: This method to study ACA territory proved to be practical, easy and with high intra-and interobserver reproducibility. P25.10 Use of three-dimensional (3D) sonography to assess the true midsagittal plane of fetal spine

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