The patients in the two groups were all treated with cerebral infarction.

两组患者均给予脑梗死常规药物治疗。

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Visual analogue scale (VAS) scores were used to assess the pain degree of patients in the two groups.

采用疼痛视觉模拟评分法(VAS)评分对两组患者的疼痛程度进行效果评价。

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To adjust for differences in baseline risk, patients in the two groups were matched on up to 63 variables.

为了调整基线危险的不同，两个组的患者在63项变量上配对。

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The researchers then approached a number of healthy people in order to compare them with the cancer patients, and find out if there was a systematic difference in mobile-phone use between the two groups.

ECONOMIST: The Interphone study: Mobile madness | The

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'