A major limitation in our study was the variability inherent in using revision specimens for the analysis of covariate factors involved in the failure process and in the wear of the bearings.
我们研究的一个主要限制是我们都用翻修的病例来进行相关变量的分析，这些变量包括了手术的失败操作过程及磨损。
The covariate analysis model with some nested factors is widely used in practical problem.
带有层套关系因子变量的协方差分析模型在实际应用中有广泛的适应性。
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