Figure 4. Association of arginine bioavailability ratios with mortality in sickle cell disease: Kaplan-Meier survival plots.
A. Survival for three categories of Arginine-to-Ornithine ratio: “High” = upper quartile, > 0.8690; “Medium” = 25th to 75th percentiles, > 0.4385 and ≤ 0.8690; “Low” = lower quartile, ≤ 0.4385. B. Survival for three categories of Arginine-to-(Ornithine + Citrulline) ratio: “High” = upper quartile, > 0.6254, “Medium” = 25th to 75th percentiles, > 0.3245 and ≤ 0.6254, “Low” = lower quartile, ≤ 0.3245.