Fig. 1From: Lymph node metastasis in young and middle-aged papillary thyroid carcinoma patients: a SEER-based cohort studyCurve-fitting analysis of age at diagnosis and tumor size, lymph node metastasis (LNM), extrathyroidal extension (ETE), and distant metastasis in papillary thyroid carcinoma (PTC) and follicular thyroid carcinoma (FTC) patients. Abbreviations: ETE, extrathyroidal extension. Tumor size was represented by the mean tumor diameter; and LNM, ETE, and distant metastasis were expressed as positivity rates. Number of observations: a, 46,884; b, 48,166; c, 47,298; d, 47,753; e, 2107; f, 2181; g, 2130; h, 2171Back to article page