After PSM in the present data set, the difference in LNM rates between ETE and non-ETE groups did not reach statistical significance (P>0.05).
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The relationship between the extent of extrathyroidal extension and lymph node metastasis based on propensity score matching analysis.
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The sentences
In this study, after eliminating intergroup differences and selection bias by using PSM, we found that the relationship between ETE and LNM may not be significant.