Observer variability in evaluating extracranial carotid artery stenosis.
Observer variability in evaluating extracranial carotid artery stenosis.
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评估颅外颈动脉狭窄的观察者变异性。
DOI：
10.1161/01.str.14.6.885
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发表时间：
1983
期刊：
影响因子：
8.3
通讯作者：
StrandnessJr,DE
中科院分区：
文献类型：
--
作者：
Chikos,PM;Fisher,LD;Hirsch,JH;Harley,JD;Thiele,BL;StrandnessJr,DE
一百二十八张颈动脉造影由三名读者两次查看，以评估颈动脉分叉处的动脉粥样硬化疾病。使用卡尺估计狭窄程度，精确到 5%，并将病变定性地表征为光滑、不规则或溃疡。总体狭窄百分比估计值和颈内动脉狭窄百分比估计值之间的观察者内相关系数为 0.94。所有血管狭窄百分比估计的观察者内平均变异性为 5.23%，颈内动脉为 6.04%，标准差为 8.09%。固定狭窄的观察者内百分比一致性被定义为在可能被读取为具有固定狭窄百分比的病例中，在两次读数中一位读者至少读取到固定百分比狭窄的时间百分比。颈内动脉大于 0% 狭窄时观察者内一致率为 95.9%，50% 或以上狭窄时为 90.4%，100% 狭窄（完全闭塞）时为 96.8%。读者之间的观察者间相关系数总体为 0.92，颈内动脉为 0.97。阅读器之间所有血管的狭窄百分比绝对差异为 7.21%，颈内动脉为 8.64%，标准差为 9.5%。颈内动脉狭窄大于 0% 时的观察者间一致性为 93.0%，50% 或以上狭窄时为 85.4%，100% 狭窄时为 96.8%。添加斜视图对狭窄百分比的估计没有统计影响，但增加了颈内动脉不规则和溃疡的诊断频率。
One hundred twenty eight cervical carotid arteriograms were twice viewed by three readers for the evaluation of atherosclerotic disease at the carotid bifurcation. Stenoses were estimated using calipers to the nearest 5% and lesions were qualitatively characterized as smooth, irregular, or ulcerated. The intraobserver correlation coefficient between estimates of percent stenosis was .94 overall and .98 for the internal carotid artery. The average intraobserver variability in estimating percent stenosis was 5.23% for all vessels and 6.04% with a standard deviation of 8.09% for the internal carotid artery. The intraobserver percent agreement at a fixed stenosis is defined as the percent of the time one reader on two readings would read at least the fixed percent stenosis among cases that might be read as having the fixed percent stenosis. The intraobserver percent agreement rate for the internal carotid artery was 95.9% at greater than 0% stenosis, 90.4% for 50% or greater stenosis, and 96.8% for 100% stenosis (total occlusion). The interobserver correlation coefficient between readers was .92 overall and .97 for the internal carotid artery. The absolute difference in percent stenosis between readers was 7.21% for all vessels and 8.64% for the internal carotid artery with a standard deviation of 9.5%. The interobserver agreement rate for the internal carotid artery at greater than 0% stenosis was 93.0%, 85.4% for 50% or greater stenosis and 96.8% at 100% stenosis. The addition of oblique views had no statistical effect on estimates of percent stenosis but increased the frequency with which irregularity and ulceration were diagnosed in the internal carotid artery.