Urbak S F, Pedersen J K, Thorsen T T
Department of Ophthalmology, Aalborg Sygehus, Denmark.
Acta Ophthalmol Scand. 1998 Oct;76(5):546-9. doi: 10.1034/j.1600-0420.1998.760507.x.
To evaluate intraobserver and interobserver reproducibility of measurements in images obtained by the 50 MHz Humphrey Ultrasound Biomicroscope.
The first stored image of central cornea, central anterior chamber, and angle structures obtained at 50 examinations were measured twice by three observers. Nine different parameters were measured in angle images and two in images of central cornea and anterior chamber. Intraobserver reproducibility was assessed by calculating the coefficient of variation and interobserver reproducibility by a two-ways ANOVA.
Intraobserver reproducibility was high for all measurements of central cornea thickness and anterior chamber depth with a coefficient of variation (%) < or = 3.8%. In angle images the intraobserver reproducibility of measurements was often lower (coefficient of variation (%) 1.3-52.6%). The lower reproducibility was most noticeable in measurements involving the less defined structures. Interobserver reproducibility was poor.
Comparison of measurements are best done of well defined structures and by only one observer.
评估50兆赫汉弗莱超声生物显微镜所获图像测量结果的观察者内和观察者间的可重复性。
由三名观察者对50次检查中获得的中央角膜、中央前房和房角结构的首张存储图像进行两次测量。在房角图像中测量九个不同参数，在中央角膜和前房图像中测量两个参数。通过计算变异系数评估观察者内可重复性，通过双向方差分析评估观察者间可重复性。
中央角膜厚度和前房深度的所有测量的观察者内可重复性都很高，变异系数（%）≤3.8%。在房角图像中，测量的观察者内可重复性通常较低（变异系数（%）为1.3 - 52.6%）。较低的可重复性在涉及定义不太明确的结构的测量中最为明显。观察者间可重复性较差。
测量结果的比较最好针对定义明确的结构且由一名观察者进行。
