Demographic characteristics of residents in Shenzhen and Xiuning in China in 2007.

*Median age and household size between urban and rural groups were compared by the Wilcoxon rank sum test, Z = 12.137, P‡Frequencies for male, age group, highest level of education, occupation status, household with children采用威尔科克森秩和检验（Wilcoxon rank sum test）对城乡两组的年龄中位数与家庭规模进行比较，所得Z值为12.137，P值标注为‡；同时统计了男性、年龄组别、最高受教育水平、职业状况及有子女家庭的频数。