Table 1.
Comparison of the baseline characteristics of the study population according to patient age
| Characteristic | Age < 40 years | 40 ≤ age < 60 years | Age ≥ 60 years | P value |
|---|---|---|---|---|
| No. of patients | 488 (14.3) | 1,650 (48.4) | 1,271 (37.3) | |
| Mean age of patients (yr) | 33.6 | 51.6 | 68.8 | < 0.001 |
| Male sex | 268 (54.9) | 915 (55.5) | 761 (59.9) | 0.064 |
| Cause of ESRD | < 0.001 | |||
| DM | 100 (20.5) | 687 (41.6) | 627 (49.3) | |
| GN | 158 (32.4) | 251 (15.2) | 104 (8.2) | |
| Renal vascular disease | 4 (0.8) | 0 (0) | 2 (0.2) | |
| Other | 226 (46.3) | 712 (43.2) | 538 (42.3) | |
| Duration of dialysis (mo) | 24.6 | 29.3 | 28.0 | 0.106 |
| Incidental dialysis | 195 (40.0) | 531 (32.2) | 431 (33.9) | 0.006 |
| Mean Hb concentration (g/dL) | < 0.001 | |||
| Hb < 10 | 148 (30.3) | 436 (26.4) | 274 (21.6) | |
| 10 ≤ Hb < 12 | 274 (56.1) | 1,068 (64.7) | 874 (68.8) | |
| Hb ≥ 12 | 66 (13.5) | 146 (8.8) | 123 (9.7) | |
| Mean albumin (g/dL) | 3.5 | 3.4 | 3.5 | 0.337 |
| Mean ferritin (ng/mL) | 245 | 279 | 308 | 0.126 |
| Mean TSAT (%) | 33.1 | 32.0 | 32.5 | 0.136 |
| Mean iPTH (pg/mL) | 664.6 | 662.4 | 634.0 | 0.663 |
| Mean CRP (mg/L) | 3.24 | 2.30 | 2.62 | 0.160 |
Data are presented as number (%) or number only.
CRP, C-reactive protein; DM, diabetes mellitus; ESRD, end-stage renal disease; Hb, hemoglobin; iPTH, intact parathyroid hormone; GN, glomerulonephritis; TSAT, transferrin saturation.