主要观察指标：期间和期间内的变异系数、组内相关系数、测试间变异性和测试-再测试结果的变异性。
MAIN OUTCOME MEASURES: Intrasession and intersession coefficient of variation, intraclass correlation coefficient, intratest variability, and test-retest variability.
组内相关系数检验是对关联度或相关性的参数检验，计算模型包括单向随机、双向混合和双向随机等三个模型。
Intraclass correlation coefficients are parametric measures of association or cor - relation, the models of whose computation involve one-way random, two-way mixed and two-way random models.
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