DESIGN: Nonrandomized, matched control experiment.
设计：非随机对照的实验研究。
Study Design. A retrospective matched cohort study with control group.
研究设计：对照配对回顾性队列研究。
The control group was matched for age, body mass index and disease stage.
对照组妇女在年龄，体重指数和疾病的阶段均匹配。
They were matched with a "control", teenagers of the same background who were otherwise healthy.
研究人员把这些患者与另一个相同年龄层的健康“控制组”做比较。
Randomly chosen control subjects were frequency-matched for age, race, and geographic study location.
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.
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。
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