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Table 1 Quantitative criteria for lung tissue involvement

From: Soluble programmed death molecule 1 (sPD-1) as a predictor of interstitial lung disease in rheumatoid arthritis

Score HRCT performance
0 NA
1 1–25% involvement
2 26–50% involvement
3 51–75% involvement
4 Range greater than 75%
  1. HRCT high-resolution computerized tomography