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Table 2 Imaging examinations (scoring method according to the proportion of paving stone signs displayed on CT)

From: Therapeutic effect of subcutaneous injection of low dose recombinant human granulocyte-macrophage colony-stimulating factor on pulmonary alveolar proteinosis

0 pointno paving stone signs
1 pointpaving stone signs less than 5%
2 points5–24% of paving stone signs
3 points25–49% of paving stone signs
4 points50–74% of paving stone signs
5 pointspaving stone signs more than≥75%