Table 1.
Baseline characteristics for the study population
| Variable | All subjects (n=9386) |
|---|---|
| Age, yr | 62.2 ± 15.5 |
| Women | 4268 (45.5) |
| White race | 5663 (60.3) |
| Comorbidities: | |
| Coronary artery disease/myocardial infarction | 929 (9.9) |
| Diabetes mellitus | 2192 (23.4) |
| Vascular access: catheter | 5564 (26.7) |
| Weight (kg) | 77.2 ± 21.9 |
| Body mass index (kg/m2) | 27.6 ± 8.4 |
| Systolic BP (mmHg) | 145 (131–159) |
| Diastolic BP (mmHg) | 74 (65–83) |
| Urea reduction ratio | 70 (63–76) |
| Laboratory data | |
| Hemoglobin (g/dl) | 10.3 (9.4–11.2) |
| Albumin (g/dl) | 3.5 (3.2–3.8) |
| Ferritin (ng/ml) | 200 (97–392) |
| Transferrin saturation (%) | 18 (14–24) |
| Phosphorus (mg/dl) | 4.5 (3.7–5.6) |
| Parathyroid hormone (pg/ml) | 209 (113–355) |
Categorical data are n (%). Continuous measures are mean ± SD. Laboratory values are median (quartile 1 to quartile 3). Some variables had <10% missing values) with the exception of urea reduction ratio (22% missing) and parathyroid hormone (13.3%),.