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