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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 point

no paving stone signs

1 point

paving stone signs less than 5%

2 points

5–24% of paving stone signs

3 points

25–49% of paving stone signs

4 points

50–74% of paving stone signs

5 points

paving stone signs more than≥75%