Fourth, residual confounding by SES or other unmeasured factors might be a concern.
第四，应该注意到由于SES或者其它不确定的因素造成的剩余混淆。
Finally, they noted that they could not rule out the possibility of residual confounding.
最后，他们指出尚不能除外残余混杂的可能性。
Thus residual confounding could not be completely excluded, and the findings could not assign causality.
这些残留的混乱不能被完全的排除，这个结果不能认为有因果关系。
This is a problem in nearly every study, and even in studies controlling for known confounding variables, residual confounding remains a concern.
这几乎每个研究都存在的问题，甚至在控制已知混杂因素的研究中，其他的混杂因素依然受到人们的关注。
Limitations of this study include reliance on recall of diet and URTI, possible misclassification of exposure because of the timing of data collection, and possible residual confounding.
本研究的局限性包括对饮食和URTI回忆的依赖、由于数据收集的限制所可能造成的对暴露的错误分类，以及可能残留的混杂因素。
Limitations of this study include reliance on recall of diet and URTI, possible misclassification of exposure because of the timing of data collection, and possible residual confounding.
本研究的局限性包括对饮食和URTI回忆的依赖、由于数据收集的限制所可能造成的对暴露的错误分类，以及可能残留的混杂因素。
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