Table 1.
Baseline characteristics of incident patients aged ≥65 years registered in the US Renal Data System by baseline predialysis systolic BP
| Patient Characteristics | Baseline pre-dialysis systolic BP Category (mm Hg) | ||||
|---|---|---|---|---|---|
| <120 (n=1180) | 120 to <140 (n=5207) | 140 to <160 (n=7032) | ≥160 (n=3581) | Overall (n=17,003) | |
| Demographics | |||||
| Age, yr, mean (SD) | 78 (7) | 77 (6) | 76 (6) | 75 (6) | 76 (6) |
| Male sex | 804 (68%) | 3029 (58%) | 3348 (48%) | 1254 (35%) | 8436 (45%) |
| Race | |||||
| White | 925 (78%) | 3858 (74%) | 4801 (68%) | 2220 (62%) | 11,806 (69%) |
| Black | 216 (18%) | 1120 (22%) | 1891 (27%) | 1176 (33%) | 4404 (26%) |
| Asian | 25 (2%) | 173 (3%) | 289 (4%) | 139 (4%) | 626 (4%) |
| Hispanic ethnicity | 77 (7%) | 354 (7%) | 567 (8%) | 314 (9%) | 1312 (8%) |
| Medicare/Medicaid eligible | 273 (23%) | 1290 (25%) | 1897 (27%) | 1054 (29%) | 4515 (27%) |
| CVC vascular access | 878 (74%) | 3334 (64%) | 4435 (63%) | 2385 (67%) | 11,033 (65%) |
| Census data, median (Q1–Q3) | |||||
| Unemployed | 9 (6–12) | 9 (7–12) | 9 (7–12) | 10 (7–13) | 9 (7–12) |
| Below poverty | 13 (8–10) | 13 (8–20) | 14 (8–21) | 15 (9–22) | 14 (8–21) |
| <High school education | 13 (8–21) | 13 (8–20) | 14 (9–21) | 15 (9–22) | 14 (9–21) |
| Monthly rent, $ | 886 (685–126) | 878 (701–1099) | 854 (688–1068) | 834 (678–1032) | 861 (688–1072) |
| Annual household income, $ | 49,214 (40,113–66,905) | 49,010 (39,517–65,884) | 48,125 (38,470–63,086) | 47,085 (37,132–61,418) | 48,239 (38,571–63,965) |
| Comorbid conditions | |||||
| Myocardial infarction | 108 (9%) | 384 (7%) | 432 (6%) | 203 (6%) | 1127 (7%) |
| Coronary artery disease | 531 (45%) | 1930 (37%) | 2291 (33%) | 1061 (30%) | 5814 (34%) |
| Coronary revascularization | 140 (12%) | 505 (10%) | 592 (8%) | 279 (8%) | 935 (9%) |
| Unstable angina | 64 (5%) | 279 (5%) | 356 (5%) | 203 (6%) | 902 (5%) |
| Heart failure | 625 (53%) | 2223 (43%) | 2802 (40%) | 1460 (41%) | 7110 (42%) |
| Valvular disease | 181 (15%) | 596 (11%) | 673 (10%) | 334 (9%) | 1784 (11%) |
| Ventricular fibrillation or other arrhythmia | 110 (9%) | 362 (7%) | 386 (5%) | 167 (5%) | 1028 (6%) |
| Pacemaker | 60 (5%) | 181 (4%) | 160 (2%) | 60 (2%) | 461 (3%) |
| Hypertension | 940 (80%) | 4220 (81%) | 5755 (82%) | 2985 (83%) | 13,903 (82%) |
| Stroke or transient ischemic attack | 108 (9%) | 437 (8%) | 576 (8%) | 310 (9%) | 1434 (8%) |
| Peripheral artery disease | 234 (20%) | 858 (17%) | 1041 (15%) | 492 (14%) | 2626 (15%) |
| Diabetes mellitus | 580 (49%) | 2745 (53%) | 4026 (57%) | 2301 (64%) | 9654 (57%) |
| Hyperlipidemia | 302 (26%) | 1418 (27%) | 2007 (29%) | 945 (26%) | 4673 (28%) |
| Lung disease | 369 (31%) | 1234 (24%) | 1491 (21%) | 688 (19%) | 3783 (22%) |
| Liver disease | 84 (7%) | 179 (3%) | 155 (2%) | 97 (3%) | 515 (3%) |
| Depression | 121 (10%) | 421 (8%) | 489 (7%) | 208 (6%) | 1239 (7%) |
| Biometric measurements, mean (SD) | |||||
| BMI at index date | 27 (7) | 28 (7) | 28 (7) | 28 (7) | 28 (7) |
| Missing, N(%) | 118 (10%) | 425 (8%) | 530 (8%) | 259 (7%) | 1332 (8%) |
| eGFR at dialysis initiation, ml/min per 1.73 m2 | 13.1 (5.5) | 12.5 (5.2) | 12.2 (5.0) | 11.7 (4.8) | 12.0 (5.0) |
| Missing, N (%) | 130 (11.0%) | 500 (9.6%) | 576 (8.2%) | 270 (7.5%) | 1476 (8.7%) |
| Dialysis length, hours | 3.5 (0.4) | 3.5 (0.4) | 3.4 (0.4) | 3.5 (0.4) | 3.5 (0.4) |
| Serum albumin, g/dl | 3.4 (0.5) | 3.5 (0.4) | 3.6 (0.4) | 3.5 (0.4) | 3.5 (0.4) |
| Predialysis systolic BP, mean (SD) | 113 (7) | 131 (6) | 149 (6) | 171 (9) | 146 (18) |
| Predialysis diastolic BP, mean (SD) | 63 (5) | 68 (6) | 73 (7) | 80 (8) | 72 (9) |
| Dialysis sessions with intradialytic hypotension, % mean (SD) | 35.1% (24.7%) | 13.4% (14.2%) | 7.3% (9.8%) | 5.3% (7.9%) | 10.7% (14.5%) |
All values are N (%) unless otherwise stated. Three patients were missing systolic BP at baseline and were excluded from this table. Overall, 144 patients reported Native American race and 23 patients reported other race. CVC vascular access was missing in 69 (0.4%) patients. <1% of patients had data missing for serum albumin, dialysis length, Hispanic ethnicity, and each of the census-based socioeconomic metrics. These variables cannot be tabulated owing to research regulations prohibiting the disclosure of cell sizes <10. CVC, central venous catheter; BMI, body mass index.