| Variables | All nodules (n = 283) | Bethesda 1 (n = 40) | Bethesda 2–6 (n = 243) | -value |
| Gender, female (n, %) | 234, 82.7 | 34, 85.0 | 200, 82.3 | 0.676 | Age, years (mean ± SD) | 57.5 ± 14.8 | 57.3 ± 14.9 | 57.5 ± 14.9 | 0.817 |
| Ethnicity (n, %) | Jewish | 193, 68.2 | 27, 67.5 | 166, 68.3 | 0.919 | Arab | 90, 31.8 | 13, 32.5 | 77, 31.7 | |
| Side (n, %) | Right | 156, 55.2 | 26, 65.0 | 130, 53.5 | 0.176 | Left | 113, 39.9 | 11, 27.5 | 102, 42.0 | | Isthmus | 14, 14.9 | 3, 7.5 | 11, 4.5 | | Diameter A (horizontal), mm (mean ± SD) | 16.8 ± 8.0 | 14.5 ± 5.3 | 17.2 ± 8.3 | 0.038 | Diameter B, (anterior-posterior) mm (mean ± SD) | 16.0 ± 7.7 | 13.5 ± 6.7 | 16.4 ± 7.8 | 0.005 |
| Cystic content (n, %) | Solid | 166, 58.7 | 26, 65.0 | 140, 57.6 | 0.175 | <50% | 89, 31.4 | 8, 20.0 | 81, 33.3 | | ≥50% | 28, 9.9 | 6, 15.0 | 22, 9.1 | |
| Calcification (n, %) | Non | 260, 91.9 | 36, 90.0 | 224, 92.2 | 0.998 | Macrocalcification | 19, 6.7 | 3, 7.5 | 16, 6.6 | | Microcalcification | 4, 1.4 | 1, 2.5 | 3, 1.2 | |
| Echogenicity (n, %) | Hyperechoic | 50, 17.7 | 6, 15.0 | 44, 18.1 | 0.669 | Isoechoic | 151, 53.4 | 22, 55.0 | 129, 53.1 | | Hypoechoic | 23, 8.1 | 5, 12.5 | 18, 7.4 | | Heteroechoic | 59, 20.8 | 7, 17.5 | 52, 21.4 | | Nodule depth, mm (mean ± SD) | 10.0 ± 6.6 | 12.1 ± 4.7 | 9.7 ± 6.8 | <0.001 | Time of surveillance, m (mean ± SD) | 9.2 ± 4.7 | 10.4 ± 5.6 | 9.0 ± 4.5 | 0.090 |
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