Fig. 5From: The original and two new derivative versions of the COMPERA 2.0 risk assessment model: useful tools for guiding balloon pulmonary angioplastyKaplan–Meier survival curves based on the risk score within 7 days after the first BPA session. A The original COMPERA 2.0 4-statum model. The reason for the best clinical-worsening free survival in high-risk group should be attributed to its small sample size. B The modified COMPERA 2.0 4-statum modelBack to article page