CD4 and anemia (phenotype): Very high ferritin concentrations were found in subjects with CD4 counts below or equal to 50 cells/mm3 (median 1078 mg/ml, IQR: 550-1824) compared to subjects with CD4 counts above 50 cells/mm3 (median 279 mg/ml, IQR: 41-465, p < 0.001), and in subjects with moderate-severe anemia (median 1223 mg/ml, IQR: 519-2764) compared to subjects without (median 436 mg/ml, IQR: 245-1296.