Table 1.
Baseline characteristics of patients according to quartile of baseline body mass index
| Variable | Total patients | Quartile 1 (< 21.19 kg/m2) | Quartile 2 (21.19–23.18 kg/m2) | Quartile 3 (23.19–25.71 kg/m2) | Quartile 4 (> 25.71 kg/m2) | P value |
|---|---|---|---|---|---|---|
| Number of patients | 6,071 (100) | 1,518 (25.0) | 1,453 (24.0) | 1,583 (26.0) | 1,517 (25.0) | |
| Age (yr) | 65.8 ± 13.7 | 66.1 ± 13.3 | 64.9 ± 13.9 | 66.3 ± 13.9 | 65.8 ± 13.5 | 0.043 |
| Sex, male | 3,489 (57.5) | 870 (57.3) | 806 (55.5) | 923 (58.3) | 890 (58.7) | 0.302 |
| Comorbidity, DM | 2,190 (36.1) | 554 (36.5) | 520 (35.8) | 582 (36.8) | 534 (35.2) | 0.792 |
| Systolic BP (mmHg) | 136.8 ± 20.2 (4,378) | 136.0 ± 20.4 (1,073) | 137.2 ± 20.1 (1,055) | 137.5 ± 19.9 (1,129) | 136.6 ± 20.3 (1,121) | 0.332 |
| Diastolic BP (mmHg) | 82.2 ± 12.2 (4,376) | 82.7 ± 12.9 (1,072) | 82.3 ± 12.2 (1,055) | 82.1 ± 12.2 (1,129) | 81.8 ± 11.9 (1,120) | 0.425 |
| Hemoglobin (g/dL) | 9.3 ± 2.8 (4,807) | 9.2 ± 2.8 (1,185) | 9.3 ± 2.9 (1,159) | 9.4 ± 2.8 (1,241) | 9.4 ± 2.7 (1,223) | 0.429 |
| Albumin (g/dL) | 3.5 ± 1.0 (4,809) | 3.5 ± 0.5 (1,074) | 3.5 ± 0.5 (1,055) | 3.5 ± 0.5 (1,131) | 3.5 ± 0.5 (1,122) | 0.660 |
| Calcium (mg/dL) | 8.5 ± 0.9 (455) | 8.7 ± 0.9 (104) | 8.6 ± 1.2 (107) | 8.56 ± 0.8 (111) | 8.4 ± 0.8 (133) | 0.277 |
| Phosphorus (mg/dL) | 4.9 ± 1.6 (455) | 4.7 ± 1.4 (85) | 4.8 ± 1.6 (121) | 4.9 ± 1.8 (136) | 5.0 ± 1.7 (113) | 0.324 |
| TC (mg/dL) | 160.0 ± 48.1 (425) | 172.6 ± 47.5 (95) | 158.2 ± 48.1 (100) | 159.2 ± 47.1 (107) | 151.9 ± 47.9 (123) | 0.017 |
| Uric acid (mg/dL) | 6.7 ± 1.8 (421) | 6.5 ± 1.7 (99) | 6.8 ± 1.6 (99) | 6.7 ± 1.9 (104) | 7.0 ± 2.0 (119) | 0.157 |
| HbA1c (%) | 6.17 ± 2.68 (224) | 5.9 ± 2.9 (43) | 5.8 ± 3.0 (50) | 5.6 ± 1.9 (55) | 6.9 ± 2.4 (74) | 0.025 |
| PNA (g/d) | 59.1 ± 117.2 (5,667) | 56.5 ± 177.8 (1,435) | 59.6 ± 94.2 (1,364) | 57.7 ± 89.7 (1,464) | 62.9 ± 78.4 (1,404) | 0.487 |
| Kt/Vurea week total | 2.23 ± 7.71 (5,173) | 2.3 ± 5.1 (1,217) | 2.0 ± 2.1 (1,240) | 2.0 ± 5.2 (1,365) | 2.0 ± 2.4 (1,347) | 0.032 |
| CCr weekly (L) | 94.40 ± 255.09 (5,162) | 94.07 ± 322.19 (1,242) | 87.14 ± 188.50 (1,234) | 83.60 ± 195.16 (1,356) | 104.68 ± 289.38 (1,330) | 0.153 |
| Intact PTH (pg/mL) | 242.9 ± 213.2 (350) | 269.9 ± 262.7 (84) | 225.3 ± 205.9 (82) | 241.3 ± 185.6 (87) | 236.1 ± 194.7 (97) | 0.574 |
Data are presented as number (%) for categorical variables, and mean ± standard deviation (number) for continuous variables.
BP, blood pressure; CCr, creatinine clearance; DM, diabetes mellitus; Hb, hemoglobin; NPNA, normalized protein equivalent of total nitrogen appearance (PNA) = PNA/(total body water/0.58); PTH, parathyroid hormone; TC, total cholesterol.