Table 1.
Baseline Characteristics of Patients Who Attended, Missed, or Rescheduled Treatment, Before Matching
| Attended (N = 378,391) | Missed (N = 4,141) | Standardized Difference, %a | Pa | Rescheduled (N = 2,300) | Standardized Difference, %a | Pa | |
|---|---|---|---|---|---|---|---|
| Age, y | 63.2 ± 14.2 | 61.4 ± 13.9 | −12.9 | <0.001 | 61.3 ± 14.9 | −13.5 | <0.001 |
| Female sex | 162,957 (43.1%) | 1,903 (46.0%) | 5.8 | <0.001 | 1,080 (47.0%) | 7.8 | <0.001 |
| Race | <0.001 | <0.001 | |||||
| White | 144,235 (38.1%) | 1,645 (39.7%) | 3.3 | 988 (43.0%) | 9.9 | ||
| African American | 139,767 (36.9%) | 1,623 (39.2%) | 4.6 | 838 (36.4%) | −1.0 | ||
| Hispanic | 64,250 (17.0%) | 614 (14.8%) | −5.9 | 324 (14.1%) | −8.0 | ||
| Asian | 14,259 (3.8%) | 82 (2.0%) | −10.7 | 68 (3.0%) | −4.5 | ||
| Other/unknown | 15,880 (4.2%) | 177 (4.3%) | 0.4 | 82 (3.6%) | −3.3 | ||
| Vascular access | <0.001 | <0.001 | |||||
| AVF | 269,618 (71.3%) | 2,790 (67.4%) | −8.4 | 1,533 (66.7%) | −10.0 | ||
| AVG | 76,868 (20.3%) | 866 (20.9%) | 1.5 | 534 (23.2%) | 7.0 | ||
| CVC | 31,899 (8.4%) | 485 (11.7%) | 10.9 | 233 (10.1%) | 5.9 | ||
| Dialysis vintage, mo | 50 [25-84] | 45 [22-79] | −8.4 | <0.001 | 46 [22-80.5] | −5.5 | <0.001 |
| Body weight, kg | 81.8 ± 22.7 | 81.9 ± 22.2 | 0.6 | 0.72 | 83.4 ± 23.6 | 6.9 | <0.001 |
| Cause of ESRD | 0.07 | 0.02 | |||||
| Diabetes | 170,028 (44.9%) | 1,856 (44.8%) | −0.2 | 1,043 (45.3%) | 0.8 | ||
| Hypertension | 117,555 (31.1%) | 1,234 (29.8%) | −2.8 | 660 (28.7%) | −5.2 | ||
| Other | 90,808 (24.0%) | 1,051 (25.4%) | 3.2 | 597 (26.0%) | 4.5 | ||
| Diabetes | 259,732 (68.6%) | 2,815 (68.0%) | −1.4 | 0.36 | 1,616 (70.3%) | 3.5 | 0.10 |
| CHF | 67,712 (17.9%) | 768 (18.5%) | 1.7 | 0.28 | 457 (19.9%) | 5.0 | 0.01 |
| Anxiety/depression | 24,602 (6.5%) | 316 (7.6%) | 4.4 | 0.003 | 196 (8.5%) | 7.7 | <0.001 |
| Hepatitis C | 3,224 (0.9%) | 56 (1.4%) | 4.8 | <0.001 | 21 (0.9%) | 0.7 | 0.75 |
| PVD | 29,429 (7.8%) | 328 (7.9%) | 0.5 | 0.73 | 186 (8.1%) | 1.1 | 0.58 |
| Albumin, g/dL | 3.9 ± 0.4 | 3.9 ± 0.4 | −6.6 | <0.001 | 3.9 ± 0.4 | −6.2 | 0.003 |
| Calcium, mg/dL | 9.0 ± 0.7 | 9.0 ± 0.7 | −0.4 | 0.79 | 8.9 ± 0.7 | −4.3 | 0.04 |
| Phosphate, mg/d | 5.1 ± 1.5 | 5.2 ± 1.5 | 3.4 | 0.03 | 5.2 ± 1.5 | 6.8 | <0.001 |
| PTH, pg/mL | 349 [231-522] | 352 [229-519] | 2.3 | 0.61 | 363.5 [236-547] | 4.1 | 0.004 |
| Ferritin, ng/mL | 741 ± 349 | 722 ± 368 | −5.3 | <0.001 | 703 ± 350 | −10.9 | <0.001 |
| TSAT, % | 30.3 ± 12.5 | 30.0 ± 12.8 | −2.6 | 0.09 | 29.0 ± 12.0 | −10.4 | <0.001 |
| Hemoglobin, g/dL | 11.0 ± 1.1 | 11.0 ± 1.2 | 1.2 | 0.43 | 11.0 ± 1.2 | −1.6 | 0.44 |
| Creatinine, mg/dL | 8.9 ± 3.0 | 8.6 ± 3.1 | −8.3 | <0.001 | 8.8 ± 3.2 | −2.1 | 0.32 |
| Kt/V | 1.6 ± 0.3 | 1.6 ± 0.3 | −8.1 | <0.001 | 1.6 ± 0.3 | −5.6 | 0.007 |
| nPCR, g/kg/d | 1.03 ± 0.28 | 0.98 ± 0.28 | −19.3 | <0.001 | 1.03 ± 0.29 | −1.1 | 0.59 |
Note: Values for categorical variables are given as number (percent), and continuous variables are given as mean ± standard deviation or median [interquartile range]. Conversion factors for units: calcium in mg/dL to mmol/L, ×0.2495; creatinine in mg/dL to μmol/L, ×88.4.
Abbreviations: AVF, arteriovenous fistula; AVG, arteriovenous graft; CHF, congestive heart failure; CVC, central venous catheter; ESRD, end-stage renal disease; nPCR, normalized protein catabolic rate; PTH, parathyroid hormone; PVD, peripheral vascular disease; TSAT, transferrin saturation.
a
Versus attended.