统计学处理 所有观测指标数据采用SPSS19.0统计学软件（Windo

Statistical analysis <br>of all observations data using SPSS19.0 statistical software (Windows) analysis and processing. <br>The statistical description of the measurement data lists the mean ± standard deviation (), and the Student t test or rank sum test is performed. <br>The statistical description of the count data lists the frequency distribution, and performs the four-grid table chi-square test or Fisher's exact probability method.

Statistical processing <br>All observational indicator data are analyzed and processed using SPSS19.0 Statistics Software (Windows).<br>The statistical description of the metering data lists the ± standard deviation (), line Student t test or rank and test.<br>The statistical description of the counting data lists the frequency distribution, the four-box table square test, or fisher's exact probability method.

Statistical treatment<br>All the observed data were analyzed by spss19.0 statistical software (Windows).<br>The statistical description of measurement data was listed as mean ± standard deviation (), and Student t test or rank sum test was performed.<br>The frequency distribution was listed in the statistical description of counting data. Chi square test or Fisher exact probability method was used.<br>