Abstract
To evaluate the inter- and intraobserver agreement for measurement of the size and volume of a niche and assessment of the shape, with the use of three-dimensional (3D) ultrasound. In this reproducibility study, 20 3D ultrasound volumes of uteri with a niche were selected, based on complete visualisation of the uterus and niche in both the longitudinal and transversal plane. Niche measurements were performed off-line twice by one observer and once by another observer. Niche measurements and assessment of shape were performed in the longitudinal and transversal plane, and niche volume in the longitudinal plane. The mean difference, 95% limits of agreement, the intraclass correlation coefficient (ICC) and Cohen's kappa were calculated to assess the inter- and intraobserver agreement. The interobserver agreement was excellent for all niche measurements (ICC >0.86), including depth and residual myometrial thickness (RMT), except for width at niche base in the transversal plane (ICC 0.74) and niche volume (ICC 0.79), which were classified as good agreement. Wide limits of agreement and a high mean difference were found for maximal width in the transversal plane. The intraobserver agreement was excellent for all measurements (ICC >0....Continue Reading
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