Table 1.
The frequency and risk of malignancy of thyroid nodules according to internal content
| Internal content | Overall (n=1,000) | Benign nodule (n=883) | Malignant nodule (n=117) | Malignancy risk (%) | P-valuea) |
|---|---|---|---|---|---|
| Purely solid | 730 (73) | 622 (70.4) | 108 (92.3) | 14.8 | <0.001 |
| Minimally cystic | 61 (6.1) | 59 (6.7) | 2 (1.7) | 3.3 | 0.035 |
| Partially cystic | 209 (20.9) | 202 (22.9) | 7 (6.0) | 3.3 | <0.001 |
Values are presented as number (%).
a)
The chi-square test or Fisher exact test was used to evaluate associations between each category of internal content and the final diagnosis.