Methods: The statistical analysis method includes descriptive statistics, dynamic series and test for upward or downward trend, correlation analysis.
方法：运用统计描述、动态数列和升降趋势检验、相关分析。
Methods: The statistical analysis method includes descriptive statistics, dynamic series and test for upward or downward trend, correlation analysis.
方法：运用统计描述、动态数列和升降趋势检验、相关分析。
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