Caffeine intake was associated with a significantly lower risk for AD , independently of other confounding variables.

咖啡因摄入量与AD风险降低明显相关, 不依赖于其他伴随因子.

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DrWilson and Dr Storm restricted their study to white, Protestant teenagers, inorder to eliminate confounding variables.

为了消除各种不确定因素,威尔森博士和斯道姆博士严选信仰新教的白人青少年作为实验对象.

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