Figure 4.

Correlation between the ratios of CD68⁺ cells to CD163⁺ or CD204⁺ cells and survival of patients with IPF. (A,B) Kaplan-Meier curves for overall survival (A) and time-to-AE (B) for patients in the IPF group who were stratified by high or low CD163+/CD68+ and CD204+/CD68+ cell ratios. The cut-off values (0.86 and 0.70, respectively), were calculated from receiver operating characteristic curves. P values were determined by the log-rank test. *, P<0.05. AE, acute exacerbation; IPF, idiopathic pulmonary fibrosis.