Table 1.
Patient characteristics stratified by baseline body mass index categories
| Characteristics | Total | Body mass index (kg/m2) |
|||
|---|---|---|---|---|---|
| <20 | 20 to <25 | 25 to <30 | ≥30 | ||
| (n = 58 106) | (n = 3772) | (n = 16 414) | (n = 17 385) | (n = 20 535) | |
| Age (years) | 61.8 ± 14.8 | 62.5 ± 17.3 | 63.6 ± 15.9 | 62.7 ± 14.5 | 59.4 ± 13.2 |
| Gender: % women | 43.8 | 49.4 | 37.6 | 38.8 | 51.8 |
| Race (%) | |||||
| White | 42.1 | 40.0 | 40.2 | 41.5 | 44.4 |
| Black | 34.1 | 35.5 | 31.5 | 32.5 | 37.4 |
| Hispanic | 16.3 | 13.5 | 18.4 | 18.4 | 13.3 |
| Asian | 3.5 | 7.2 | 5.7 | 3.3 | 1.2 |
| Other | 4.0 | 3.9 | 4.2 | 4.2 | 3.7 |
| Primary insurance (%) | |||||
| Medicare | 52.1 | 55.8 | 53.7 | 52.3 | 49.9 |
| Medicaid | 7.5 | 9.3 | 8.3 | 7.4 | 6.6 |
| Other | 40.4 | 34.9 | 38.0 | 40.3 | 43.4 |
| Initial vascular access type (%) | |||||
| Central venous catheter | 73.9 | 76.8 | 74.9 | 73.3 | 73.1 |
| Arteriovenous fistula | 17.2 | 14.1 | 16.6 | 18.1 | 17.4 |
| Arteriovenous graft | 4.7 | 4.7 | 4.6 | 4.6 | 4.9 |
| Other and unknown | 4.2 | 4.4 | 3.9 | 4.0 | 4.6 |
| Comorbidities (%) | |||||
| Diabetes | 68.3 | 48.7 | 60.7 | 68.7 | 77.6 |
| Hypertension | 53.1 | 58.9 | 56.3 | 53.3 | 49.4 |
| Congestive heart failure | 44.5 | 36.7 | 39.6 | 43.6 | 50.7 |
| Atherosclerotic heart disease | 16.6 | 16.1 | 16.6 | 16.6 | 16.7 |
| Other cardiovascular disease | 16.3 | 16.8 | 16.4 | 16.4 | 16.2 |
| Cerebrovascular disease | 1.8 | 1.9 | 1.9 | 1.8 | 1.7 |
| Dyslipidemia | 29.8 | 28.0 | 28.5 | 30.3 | 30.9 |
| HIV | 0.4 | 0.8 | 0.7 | 0.4 | 0.3 |
| Chronic obstructive pulmonary disease | 4.9 | 5.4 | 4.1 | 4.8 | 5.5 |
| History of malignancy | 2.0 | 2.2 | 2.2 | 2.0 | 1.7 |
| Alcohol dependence (%) | 0.2 | 0.5 | 0.3 | 0.2 | 0.1 |
| Substance abuse (%) | 0.2 | 0.6 | 0.3 | 0.2 | 0.1 |
| Body mass index (kg/m2) | 28.7 ± 7.1 | 18.6 ± 1.1 | 22.8 ± 1.4 | 27.3 ± 1.5 | 36.4 ± 5.6 |
| Post-dialysis weight at 1 month (kg) | 81.6 ± 21.9 | 53.4 ± 7.6 | 65.3 ± 9.1 | 78.5 ± 10.6 | 102.6 ± 19.4 |
| Post-dialysis weight at 5 months (kg) | 79.7 ± 20.9 | 53.8 ± 8.3 | 64.7 ± 9.7 | 76.7 ± 11.2 | 98.9 ± 19.1 |
| Post-dialysis weight at 12 months (kg) | 79.9 ± 21.0 | 54.8 ± 9.0 | 65.5 ± 10.4 | 77.1 ± 12.2 | 98.5 ± 19.7 |
| Dialysis dose: single-pool Kt/V | 1.4 ± 0.4 | 1.6 ± 0.4 | 1.5 ± 0.4 | 1.4 ± 0.4 | 1.3 ± 0.4 |
| Dialysis ultrafiltration (kg) | 1.9 ± 0.9 | 1.5 ± 0.8 | 1.7 ± 0.8 | 1.8 ± 0.9 | 2.1 ± 0.9 |
| Normalized protein catabolic rate (g/kg/day) | 0.7 ± 0.2 | 0.7 ± 0.2 | 0.7 ± 0.2 | 0.7 ± 0.2 | 0.7 ± 0.2 |
| Laboratory parameters | |||||
| Hemoglobin (g/dL) | 10.3 ± 1.2 | 10.3 ± 1.3 | 10.3 ± 1.3 | 10.3 ± 1.2 | 10.3 ± 1.2 |
| White blood cells (× 103/µL) | 8.0 ± 3.0 | 7.8 ± 3.2 | 7.8 ± 3.1 | 7.9 ± 2.9 | 8.3 ± 2.9 |
| Lymphocyte (% of white blood cells) | 19.5 ± 7.8 | 19.1 ± 8.1 | 19.4 ± 8.0 | 19.5 ± 7.7 | 19.6 ± 7.6 |
| Albumin (g/dL) | 3.5 ± 0.5 | 3.4 ± 0.5 | 3.4 ± 0.5 | 3.5 ± 0.5 | 3.5 ± 0.5 |
| Calcium (mg/dL) | 8.5 ± 0.7 | 8.5 ± 0.8 | 8.5 ± 0.7 | 8.5 ± 0.7 | 8.6 ± 0.7 |
| Phosphorus (mg/dL) | 4.7 ± 1.3 | 4.6 ± 1.3 | 4.7 ± 1.3 | 4.7 ± 1.2 | 4.8 ± 1.2 |
| Creatinine (mg/dL) | 6.0 ± 2.4 | 5.6 ± 2.2 | 6.0 ± 2.3 | 6.1 ± 2.4 | 6.0 ± 2.4 |
| Bicarbonate (mEq/L) | 23.6 ± 3.3 | 23.3 ± 3.5 | 23.5 ± 3.3 | 23.5 ± 3.2 | 23.7 ± 3.2 |
| Total iron binding capacity (mg/dL) | 228.7 ± 51.3 | 214.1 ± 51.6 | 222.1 ± 49.6 | 228.6 ± 50.6 | 236.8 ± 51.7 |
Data are presented as the mean ± standard deviation or percentages.