Accordingly, the two different lever classes pre-experiment have no marked difference or they minimize the difference pro-experiment.
试验前有差异的两个班，在试验后没有显著差异或差异度减小。
Results: SOD and MDA in umbilical blood have significantly changed because of perinatal hypoxia, and GPX has decreased in a certain degree but no marked difference compared with that in control group.
结果：围产期缺氧能引起新生儿脐血中SOD及MDA显著意义的改变；gpx有一定程度的降低，与对照组比较无差异。
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