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Table 4 Comparison of malignancy rates by FNA category among this study, the Bethesda System, and published values in other studies

From: Rates of thyroid malignancy by FNA diagnostic category

FNA category This study n = 388 Bethesda range Yang et al., 2007[3] n = 1052 Jo et al., 2010[4] n = 892 Wu, 2011[5] n = 221
Unsatisfactory 18.2 1-4 10.9 8.9 14
Benign 16.0 0-3 7.3 6.5 3
Abnormal 24.7 5-15 13.5 17 6
SFN 32.6 15-30 32.2 25.4 22
SFM 94.1 60-75 64.7 70 56
Malignant 100.0 97-99 98.6 98.1 100
Overall 28.4 -- 45.3 31.3 29.0
  1. FNA – fine needle aspiration, SFN – Suspicious for Neoplasm, SFM – Suspicious for Malignancy.