Table 3.

Implied ROM assigned to each diagnostic category before and after the introduction of the NIFTP histological diagnosis

Bethesda category	Initial ROM	ROM after NIFTP
I.	5–10	5–10
II.	0–3	0–3
III.	10–30	6–18
IV.	25–40	10–40
V.	50–75	45–60
VI.	97–99	94–96

NIFTP: Non-invasive follicular thyroid neoplasm with papillary-like nuclear features; ROM: Risk of malignancy