本研究的不足(局限)在于(由此产生的)医生的偏倚有可能妨碍或延迟治疗老年患者。

A limitation of this study is that physician bias may have precluded or delayed initiation of treatment in older patients.

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最新研究显示这些早期的研究由于用到病例对照研究，结果已经有偏倚。

But it appears that some of these early investigations may have been biased by the use of "case-control" studies.

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分析认为，本实验选择的对象是一人有两颗以上龋齿的儿童，这就避免了不同口腔环境、口腔习惯和饮食习惯造成的偏倚。

Because this study choosed the children who had at least two carious teeth at the same time that avoided bias on different oral circumstance, different oral habit, and different dietetic habit.

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