Methods The fixed effect model was used for data analysis.

方法采用固定效应模型进行数据分析。

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LM test proves the random effect model is superior to the fixed effect model.

LM检验证明随机效应模型优于固定效应模型。

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LM test proves the random effect model is superior to the fixed effect model.

LM检验证明随机效应模型优于固定效应模型。

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