People used to analyze hospitalization expense with general linear models, but general linear model is built on some hypothesis.
人们以前常常采用古典线性回归模型对住院费用进行分析，但是古典线性回归模型是建立在一些假设之上的。
METHODS: general linear models with mixed effects and generalized linear mixed models (GLMM) were adapted to investigate the difference between groups.
方法：采用混合效应的一般线性模型和混合效应的广义线性模型。
METHODS: general linear models with mixed effects and generalized linear mixed models (GLMM) were adapted to investigate the difference between groups.
方法：采用混合效应的一般线性模型和混合效应的广义线性模型。
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