《Table 1 Baseline clinicopathologic features of papillary thyroid carcinoma patients with/without ex

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《Ultrasound features of extranodal extension in the metastatic cervical lymph nodes of papillary thyroid cancer:a case-control study》

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*Continuous variable was described by mean±standard deviation and compared with independent sample t-test.

A 1:2 ratio of matched case to controls was applied，to avoid bias from of clinical feature disparities.A total of 120patients with papillary thyroid carcinomas with cervical lymph nodes metastases and without extranodal extension comprised the control group（Table 1）.