不同经济水平组NC、PC的差异都有统计学意义（P<0.001）。
The difference of PC and NC in different economic level group had statistical significance(P<0.001).
D-二聚体水平在两组间差异无统计学意义（P>0.05）。
The level of D-dimer was no significantly difference in the two groups(P>0.05).
D-二聚体水平在两组间差异无统计学意义（P>0.05）。
The level of D-dimer was no significantly difference in the two groups(P>0.05).
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