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Diagnostic indices of fine-needle aspiration cytology (FNAC) in the five thyroid nodule size categories.
| Group | A (≤0.5 cm) | B (>0.5–1 cm) | C (>1-2 cm) | D (>2–4 cm) | E (>4 cm) | p value |
|---|---|---|---|---|---|---|
| Sensitivity | 96.8 | 94.9 | 98.7 | 86.7 | 50 | 0.006 |
| Specificity | 100 | 93.9 | 100 | 100 | 100 | 0.575 |
| PPV | 100 | 98.8 | 100 | 100 | 100 | 0.745 |
| NPV | 76.9 | 77.5 | 97 | 92 | 85.7 | 0.076 |
| Diagnostic accuracy | 96.8 | 94.8 | 99 | 94.7 | 87.5 | — |
PPV: positive predictive value; NPV: negative predictive value.
