The difference of PC and NC in different economic level group had statistical significance(P<0.001).
不同经济水平组NC、PC的差异都有统计学意义（P<0.001）。
Descriptive analysis and difference significance test of statistics method were adopted in finally result analysis.
最后结果采用统计方法进行描述性分析和差异显著性检验。
The difference of economic status structure has statistical significance.
四县之间的差异有统计学意义。
The difference of economic status structure has statistical significance.
四县之间的差异有统计学意义。
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