Table 1 Baseline characteristics
|  | All patients (N = 50,701)a | Patients with anemia (N = 11,673) | Patients without anemia (N = 35,033) |
|---|---|---|---|
Sex, n (%) | |||
 Female | 28,450 (56.1) | 7175 (61.5) | 19,116 (54.6) |
Mean age, years (SD) | 72.0 (13.1) | 71.2 (14.4) | 72.2 (12.8) |
Age group, n (%) | |||
  < 50 years | 2758 (5.4) | 917 (7.9) | 1715 (4.9) |
 50–59 years | 5613 (11.1) | 1425 (12.2) | 3835 (10.9) |
 60–69 years | 11,969 (23.6) | 2645 (22.7) | 8271 (23.6) |
 70–79 years | 14,372 (28.3) | 2913 (25.0) | 10,043 (28.7) |
  ≥ 80 years | 15,989 (31.5) | 3773 (32.3) | 11,169 (31.9) |
Race, n (%) | |||
 African American | 13,637 (26.9) | 3559 (30.5) | 8927 (25.5) |
 Asian | 543 (1.1) | 96 (0.8) | 406 (1.2) |
 Hispanic | 888 (1.8) | 245 (2.1) | 584 (1.7) |
 White | 31,975 (63.1) | 7085 (60.7) | 22,530 (64.3) |
 Other/unknown | 3658 (7.2) | 688 (5.9) | 2586 (7.4) |
CKD stage, n (%)b | |||
 3a | 30,204 (59.6) | 4979 (42.7) | 22,444 (64.1) |
 3b | 13,882 (27.4) | 3548 (30.4) | 9386 (26.8) |
 4 | 4880 (9.6) | 2050 (17.6) | 2597 (7.4) |
 5 | 1735 (3.4) | 1096 (9.4) | 606 (1.7) |
Hb stratac g/dL, n (%) | |||
  < 8.0 | 4147 (8.2) | 4147 (35.5) | – |
 8.0–9.9 | 7526 (14.8) | 7526 (64.5) | – |
 10.0–12.0 | 15,196 (30.0) | – | 15,196 (43.4) |
  > 12.0 | 19,837 (39.1) | – | 19,837 (56.6) |
 Missing | 3995 (7.9) | – | – |
Anemia therapy, n (%) | |||
 ESA | 539 (1.1) | 483 (4.1) | 53 (0.2) |
 Iron (IV and oral) | 4283 (8.4) | 2825 (24.2) | 1410 (4.0) |
 RBC transfusion | 1306 (2.6) | 1287 (11.0) | 19 (0.1) |
 Any of the above | 5219 (10.3) | 3703 (31.7) | 1468 (4.2) |