However, given the small sample size and limited nature of the population studied, naturally these results should be taken with a grain of salt until replicated by other researchers.
但因研究对象范围小以及研究对象的局限性，在有其他研究者进行此研究前，对此研究结果应持谨慎态度。
The main approach to solve this problem is to stratify the population studied through taking the confounder as the stratifying variable.
解决这一问题的主要方法是将混杂因子作为分层变量把被研究群体分层。
The main approach to solve this problem is to stratify the population studied through taking the confounder as the stratifying variable.
解决这一问题的主要方法是将混杂因子作为分层变量把被研究群体分层。
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