Table 1. Demographic and baseline characteristics by estimated glomerular filtration rate (n = 610).
| Characteristics | eGFR ≥ 60 ml/min/1.73 m2 | eGFR 45 – 59 ml/min/1.73 m2 | eGFR < 45 ml/min/1.73 m2 | p value for trend |
|---|---|---|---|---|
| eGFR (ml/min/1.73 m2) | 72 ± 10 | 53 ± 4 | 37 ± 7 | |
| n (%) | 288 (47.2) | 222 (36.4) | 100 (16.4) | |
| Age (years) | 84 ± 7 | 86 ± 7 | 87 ± 7 | < 0.001 |
| Weight (kg) | 58 ± 12 | 60 ± 12 | 60 ± 13 | 0.13 |
| Height (cm) | 155 ± 7 | 154 ± 7 | 155 ± 7 | 0.52 |
| Body mass index (kg/m2) | 25 ± 5 | 25 ± 5 | 25 ± 5 | 0.24 |
| Calcium intake (mg/day) | 557 ± 244 | 555 ± 221 | 594 ± 262 | 0.33 |
| Vitamin D intake (IU/day) | 40 ± 26 | 41 ± 29 | 43 ± 30 | 0.35 |
| Serum calcium (mg/dl) | 9.1 ± 0.4 | 9.3 ± 0.4 | 9.2 ± 0.4 | 0.80 |
| Serum phosphorus (mg/dl) | 3.2 ± 0.5 | 3.2 ± 0.4 | 3.3 ± 0.5 | 0.40 |
| Bone alkaline phosphatase (ng/ml) | 16 ± 16.8 | 15.3 ± 9.1 | 15.8 ± 12.5 | 0.22 |
| 25(OH)D (ng/ml) | 8.8 ± 6.4 | 9.1 ± 5.8 | 8.7 ± 6.6 | 0.50 |
| iPTH (pg/ml) | 62.3 ± 44.3 | 72.7 ± 67.4 | 86.3 ± 60 | < 0.001 |
| Bone mineral density (g/cm2) | 0.3 ± 0.1 | 0.3 ± 0.1 | 0.3 ± 0.1 | 0.80 |
All values are expressed as means ± SD. eGFR = estimated glomerular filtration rate; 25(OH)D = 25-hydroxyvitamin D; iPTH = intact parathyroid hormone.