The NLST is the first trial with sufficient numbers of participants using a randomized design to enable the comparison of mortality differences between spiral CT and chest X-ray, Aberle said.
NLST则是第一次包含大量随机指定的受试者的实验，使得在螺旋CT成像和X射线胸透之间做死亡率的比较成为了可能。
Methods: Randomized, double-blind and drug parallel comparison trial were adopted.
方法：采用随机、双盲、平行对照试验。
The measurement data in multiple groups were compared with randomized analysis of variance and the comparison among groups were performed with SNK test.
多组间的计量资料比较采用随机分组的方差分析，组间比较采用SNK检验。
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