Only half of the devices were compared with controls.

仅有一半的设备与正常的对照组进行了对比。

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In the transition and senescence phases, the supplement extended the average life span of the remaining flies by 30% compared with controls.

在过渡期和衰老期，这种补充剂让存活果蝇的寿命比对照组长30%。

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Methods: The levels of serum IL-8 in 66 patients with servere acute respiratory syndrome (SARS) were measured by RIA, and compared with controls.

方法用放射免疫法检测了66例SARS患者血清IL-8含量，与正常对照组作了比较。

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They found that aspirin reduced the risk of a cancer death by 15% compared with controls.

FORBES: Meta-Analysis Adds New Evidence For Cancer Benefits Of Daily Aspirin

But at 24 months, the December-born California boys had unexpectedly high cognitive scores compared with controls.

WSJ: Exercise in Short Bursts Is Effective

After four weeks, significant changes were recorded in the hippocampus of the enriched-environment mice compared with controls.

WSJ: Why Young Children Don't Notice Coming Cars