他们被随机安排到治疗组和安慰剂组。
They were randomly assigned to either a treatment group or a placebo group.
这样的研究并不必然需要安慰剂组。
安慰剂组术后使用止痛药更多。
安慰剂组服法同治疗组。
但是两组患者两年后的总存活率相似，服药组为88％，服用安慰剂组为80％。
Overall survival after two years was similar among both groups—88% on the drug versus 80% on placebo.
第四组服用两片安慰剂。
这些患者的体重都下降了10%，被分成使用瘦素的试验组和使用安慰剂的对照组。
Their weight was reduced by 10% and they were given either replacement leptin or a placebo.
对照组予西医常规加安慰剂治疗。
The control group received placebo adding to regular western medicine.
它仅仅是一组服用安慰剂，一种无害的物质。
它仅仅是一组服用安慰剂，一种无害的物质。
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