可能样本量不够大，因而得出的结论不具有统计学意义，或者说在某种程度上是有偏颇的。

It is possible that the sample size is not large enough to be significant or skewed in some way.

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该试验样本量较小，观察时间不够长，没有与采用其它方法治疗或未治疗的同样病人进行比较。

But the study was small, did not monitor the patients for very long and did not compare them with similar patients who were given alternative therapy or remained untreated.

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