Figure. Kaplan-Meier Estimates of Survival for Patients With Sickle Cell Disease by Pulmonary Hypertension Status

A, The age-adjusted hazard ratio (HR) was 3.43 (95% CI, 1.02-11.55; P=.047) for the comparison between patients with pulmonary hypertension documented by right heart catheterization (RHC) and those who did not have pulmonary hypertension documented by RHC; 2.14 (95% CI, 1.25-3.67; P=.006) for patients with pulmonary hypertension vs those who did not undergo RHC (uncatheterized); and 0.62 (95% CI, 0.19-2.03; P=.43) for patients without pulmonary hypertension vs those who did not undergo RHC (uncatheterized). B, The HR was 3.35 (95% CI, 1.01-11.31; P=.04) for the comparison between patients with pulmonary hyperten- sion documented by RHC and those who did not have pulmonary hypertension documented by RHC; 1.73 (95% CI, 1.02-2.93; P=.04) for patients with pulmonary hypertension vs those who did not undergo RHC (uncatheterized); and 0.49 (95% CI, 0.15-1.59; P=.23) for patients without pulmonary hypertension vs those who did not undergo RHC (uncatheterized).