Table 2.

Scoring matrix for lung pathology categories.

Category	Criteria	Scoring system
Inflammation	Intensity of neutrophilic infiltrate in affected areas	0: absent
		1: minimal
		2: mild
		3: moderate
		4: severe
% Distribution	Proportion of parenchyma affected	1: < 25%
		2: 26–50%
		3: 51–75%
		4: 76–100%
Type II pneumocyte hyperplasia	Extent of hypertrophy of alveolar pneumocytes	1: < 25%
		2: 26–50%
		3: 51–75%
		4: 76–100%
Hemorrhage	Intensity of hemorrhage in affected areas	0: absent
		1: minimal
		2: mild
		3: moderate
		4: severe