Table 3.
Comparison of baseline patient characteristics by attendance status: post-match
| Variables | Overall, N = 7692 | Attended, N = 6410 | Absence, N = 1282 | Standardized difference (%) | P-value |
|---|---|---|---|---|---|
| Age (years) | 0.76 | ||||
| Mean ± SD | 60.6 ± 14.8 | 60.6 ± 14.8 | 60.5 ± 14.5 | −0.9 | |
| Gender, n (%) | 0.62 | ||||
| Female | 3564 (46.3) | 2978 (46.5) | 586 (45.7) | −1.5 | |
| Race, n (%) | 0.99 | ||||
| White | 2646 (34.4) | 2203 (34.4) | 443 (34.6) | 0.4 | |
| Black | 3539 (46.0) | 2949 (46.0) | 590 (46.0) | 0.0 | |
| Hispanic | 1151 (15.0) | 961 (15.0) | 190 (14.8) | −0.5 | |
| Asian | 95 (1.2) | 80 (1.2) | 15 (1.2) | −0.7 | |
| Other/unknown | 261 (3.4) | 217 (3.4) | 44 (3.4) | 0.3 | |
| Vascular access, n (%) | 0.72 | ||||
| Arteriovenous fistula | 4914 (63.9) | 4083 (63.7) | 831 (64.8) | 2.3 | |
| Arteriovenous graft | 1919 (24.9) | 1605 (25) | 314 (24.5) | −1.3 | |
| Central venous catheter | 859 (11.2) | 722 (11.3) | 137 (10.7) | −1.8 | |
| Dialysis vintage (months) | 0.97 | ||||
| Median [p25, p75] | 46 [25, 75] | 46 [25, 75] | 45 [24, 76] | −1.1 | |
| Target weight (kg) | 0.24 | ||||
| Mean ± SD | 82.0 ± 23.0 | 82.2 ± 23.2 | 81.3 ± 22.2 | −3.6 | |
| Etiology of ESRD, n (%) | 0.99 | ||||
| Diabetes | 3568 (46.4) | 2974 (46.4) | 594 (46.3) | −0.1 | |
| Hypertension | 2425 (31.5) | 2020 (31.5) | 405 (31.6) | 0.2 | |
| Other | 1699 (22.1) | 1416 (22.1) | 283 (22.1) | 0.0 | |
| Atrial fibrillation, n (%) | <10 | <10 | <10 | −1.0 | 0.75 |
| Diabetes, n (%) | 5588 (72.6) | 4664 (72.8) | 924 (72.1) | −1.5 | 0.61 |
| Congestive heart failure, n (%) | 1251 (16.3) | 1050 (16.4) | 201 (15.7) | −1.9 | 0.53 |
| Coronary artery disease, n (%) | 921 (12.0) | 773 (12.1) | 148 (11.5) | −1.6 | 0.60 |
| Cerebrovascular disease, n (%) | 80 (1.0) | 68 (1.1) | 12 (0.9) | −1.3 | 0.69 |
| Peripheral vascular disease, n (%) | 615 (8.0) | 514 (8.0) | 101 (7.9) | −0.5 | 0.87 |
| Serum albumin (g/dL) | 0.73 | ||||
| Mean ± SD | 3.9 ± 0.4 | 3.9 ± 0.4 | 3.9 ± 0.4 | −1.1 | |
| Serum calcium (mg/dL) | 0.82 | ||||
| Mean ± SD | 9.0 ± 0.7 | 9.0 ± 0.7 | 9.0 ± 0.7 | 0.7 | |
| Creatinine (mg/dL) | 0.84 | ||||
| Mean ± SD | 8.6 ± 3.0 | 8.6 ± 3.0 | 8.6 ± 2.9 | 0.6 | |
| Ferritin (ng/mL) | 0.85 | ||||
| Mean ± SD | 765.1 ± 362.3 | 765.5 ± 361.5 | 763.3 ± 366.2 | −0.6 | |
| Hemoglobin (g/dL) | 0.92 | ||||
| Mean ± SD | 10.9 ± 1.1 | 10.9 ± 1.1 | 10.9 ± 1.1 | −0.3 | |
| Serum phosphate (mg/dL) | 0.23 | ||||
| Mean ± SD | 5.1 ± 1.4 | 5.1 ± 1.4 | 5.1 ± 1.4 | 3.7 | |
| Parathyroid hormone (ng/mL) | 0.33 | ||||
| Median [p25, p75] | 335 [217, 519] | 334 [214, 518] | 338 [227, 522] | 4.2 | |
| Transferrin saturation (%) | 0.76 | ||||
| Mean ± SD | 31.1 ± 12.3 | 31.1 ± 12.3 | 31.0 ± 12.4 | −0.9 | |
| nPCR (g/kg/day) | 0.35 | ||||
| Mean ± SD | 1.0 ± 0.3 | 1.0 ± 0.3 | 1.0 ± 0.3 | −2.9 | |
| Kt/V | 0.37 | ||||
| Mean ± SD | 1.6 ± 0.3 | 1.6 ± 0.3 | 1.6 ± 0.3 | −2.7 |
Abbreviations: ESRD, end-stage renal disease; K, dialyzer clearance of urea; t, dialysis time; V, volume of distribution of urea; nPCR, normalized protein catabolic rate; p25, 25th percentile; p75, 75th percentile; SD, standard deviation.