他们还随机选取了年龄、种族和所在地区都相符的对照样本。
Randomly chosen control subjects were frequency-matched for age, race, and geographic study location.
这项计划是通过与附近地区相匹配的对照样本案例进行对比来评估的。
The scheme was evaluated using a matched control sample of cases from adjacent areas.
而总抗氧化能力(TAC)水平和DNA损伤方面未显示与对照样本有明显差异。
Levels of TAC and DNA damage showed no significant differences from the unexposed group.
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