Table 4. Score for pulmonary fibrosis.

Score	Description
0	No pulmonary fibrosis
1	Mild pulmonary fibrosis, the affected area less than 20% of the whole lung
2	Moderated pulmonary fibrosis, the affected area of the lung accounted for 20% to 50%
3	Severe pulmonary fibrosis, involved area was greater than 50%