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。
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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