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.
结果表明采用不同方法处理的对照样会对实验结果产生较大影响。
The test result showed that different Control Samples have strong influence on the results.
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.
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