Figure 1: Vitamin D levels correlate significantly and inversely with reticulocytosis in pediatric and adult SCD patients. a,b. Pediatric and adult patients with insufficient levels of vitamin D tend to have higher reticulocyte counts than patients who are vitamin D sufficient (p=0.006 and p=0.014, respectively). The overall trend is nearly identical in both populations, with similar trendline equations and R2 values. Data points reflect individual patients.