Methods: 48 patients with malignant ascites were divided randomly into two groups.

48例恶性腹腔积液患者分为治疗组和对照组。

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MethodTotal 80 patients with breast cancer were divided randomly into two groups, experiment group and control group, 40 cases in each group.

方法：80例乳腺癌患者患者根据术前护理干预方法的不同，随机分为试验组和对照组，每组40例。

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Methods: 60 cases of early phase diabetic nephropathy patients were divided randomly into two groups, 30 in the therapeutic group and 30 in the control group.

方法：将60例早期糖尿病肾病患者随机分为治疗组与对照组，每组30例。

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This study randomly divided patients into two groups - one received the antibiotic and the other was given a placebo, an inert treatment in the form of a sugar pill, three times a day for seven days.

BBC: Antibiotics 'ineffective for coughs'