Abnormality

Grading for each abnormality

Anatomical regions scored

Percentage disease extent

Score

Ground-glass opacity alone
Mixed ground glass and reticular disease
Reticular fibrosis alone
Honeycombing

0
1-25%
26-50%
51-75%
>75%

0
1
2
3
4

Lobes are scored independently
Lingula is considered a separate lobe
6 total lobes

Global score: summation of scores for each abnormality, in all lobes

Also used by Choi et al. [26]; Mok et al. [28]; Pandey et al. [30]; Tiev et al. [31].