Table 3.

IOTA simple rules risk calculator (SRrisk) model (Adapted from reference 1)

Features	Risk stratum	Estimated risk of malignancy
>2 B-features	Very low risk	0.01 to 0.29%
Only B1 or only 2 B-features	Low risk	0.19 to 3.1%
Only 1 B-feature (other than B1)	Intermediate risk	2.4 to 15.2%
2 sub-categories (both M- and B-features): Equal no. of M- and B-features More B-features than M-features	Elevated risk	2 sub-categories: 5.6 to 78.1% 1.3 to 28.4%
More M-features than B-features	Very high risk	42 to>99.9%