Prognostic Score Comparison in IPF and HP

For each patient in the IPF, fibrotic HP, and non-fibrotic HP groups, the GAP index was calculated based on age, gender, FVC, and DLCO values. According to the GAP index, patients were classified as Stage 1 (0-3 points), Stage 2 (4-5 points), and Stage 3 (6-8 points).

In addition to the GAP parameters, the index was calculated to include the ILD subtype as well.

"The CPI (Composite Physiologic Index) was calculated using the following formula:~CPI = 91 - (0.65 × %DLCO) - (0.53 × %FVC) + (0.34 × %FEV1).~DLCO: Diffusing Capacity of the Lung for Carbon Monoxide FVC: Forced Vital Capacity FEV₁: Forced Expiratory Volume in One Second"