Table 1. Patient characteristics overall and by hemoglobin variability group, 2004 and 2012 cohorts. .
| Hemoglobin variability groups* | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | LL | II | HH | LI | IH | LH | ||||||||
| 2004 | 2012 | 2004 | 2012 | 2004 | 2012 | 2004 | 2012 | 2004 | 2012 | 2004 | 2012 | 2004 | 2012 | |
| Total n | 159,720 | 200,728 | 2165 | 2200 | 9646 | 18,999 | 3750 | 10,552 | 29,222 | 48,029 | 50,680 | 60,525 | 64,257 | 60,423 |
| Age, mean, yrs. (SD) | 62.3 (15.2) | 63.0 (14.7) | 55.9 (15.9) | 58.2 (15.7) | 63.7 (14.8) | 65.2 (14.2) | 62.1 (15.4) | 57.8 (13.7) | 61.5 (15.2) | 63.3 (14.8) | 62.9 (14.9) | 63.4 (14.6) | 62.1 (15.3) | 62.9 (15.0) |
| Age | ||||||||||||||
| 0 – 44 | 13.9 | 11.6 | 25.3 | 19.9 | 11.6 | 8.6 | 15.0 | 16.6 | 15.1 | 11.5 | 12.7 | 10.8 | 14.4 | 12.2 |
| 45 – 64 | 36 | 39.5 | 41.6 | 42.3 | 34.7 | 37.0 | 35.4 | 52.1 | 37.3 | 38.6 | 35.8 | 39.8 | 35.6 | 38.4 |
| 65 – 74 | 26.3 | 25.0 | 19.6 | 22.0 | 27.2 | 26.2 | 26.3 | 19.2 | 25.7 | 25.5 | 26.7 | 25.0 | 26.3 | 25.2 |
| ≥ 75 | 23.8 | 23.9 | 13.5 | 15.8 | 26.6 | 28.1 | 23.4 | 12.1 | 22.0 | 24.5 | 24.9 | 24.3 | 23.6 | 24.2 |
| Sex | ||||||||||||||
| Female | 48.7 | 46.0 | 46.1 | 44.9 | 45.9 | 47.5 | 43.7 | 22.7 | 49.0 | 49.7 | 47.3 | 43.2 | 50.55 | 49.6 |
| Male | 51.3 | 54.0 | 54.0 | 55.1 | 54.1 | 52.5 | 56.3 | 77.3 | 51.0 | 50.3 | 52.7 | 56.8 | 49.44 | 50.4 |
| Race | ||||||||||||||
| White | 53.4 | 53.1 | 48.5 | 45.8 | 58.5 | 54.9 | 51.3 | 53.8 | 54.7 | 51.6 | 53.4 | 55.0 | 52.36 | 52.0 |
| Black | 40.3 | 40.3 | 46.6 | 48.8 | 35.0 | 37.6 | 41.6 | 40.3 | 39.2 | 41.3 | 40.3 | 38.9 | 41.32 | 41.4 |
| Other | 6.3 | 6.6 | 4.9 | 5.4 | 6.5 | 7.5 | 7.1 | 5.9 | 6.2 | 7.0 | 6.3 | 6.1 | 6.32 | 6.6 |
| Dialysis duration, mean, yrs. (SD) | 4.1 (4.3) | 5.6 (5.0) | 4.9 (4.9) | 5.9 (5.5) | 4.2 (4.1) | 5.4 (4.7) | 3.9 (4.4) | 7.1 (5.8) | 4.4 (4.3) | 5.6 (4.9) | 4.0 (4.3) | 5.5 (5.1) | 4.0 (4.3) | 5.4 (5.1) |
| Primary cause of ESRD | ||||||||||||||
| Diabetes | 42.8 | 44.6 | 35.1 | 35.9 | 43.4 | 46.5 | 42.4 | 36.2 | 42.7 | 45.3 | 42.9 | 44.7 | 43.0 | 45.2 |
| Hypertension | 29.8 | 29.9 | 27.3 | 27.0 | 28.4 | 30.1 | 30.4 | 30.3 | 28.5 | 29.3 | 30.5 | 30.4 | 30.0 | 29.8 |
| Other | 27.4 | 25.5 | 37.6 | 37.0 | 28.2 | 23.4 | 27.3 | 33.4 | 28.8 | 25.4 | 26.7 | 24.9 | 27.0 | 25.0 |
| Hospitalization | ||||||||||||||
| No | 55.0 | 63.0 | 32.2 | 37.8 | 74.4 | 77.1 | 71.3 | 81.1 | 48.6 | 55.4 | 66.7 | 71.9 | 45.58 | 53.5 |
| Yes | 45.0 | 37.0 | 67.8 | 62.2 | 25.6 | 22.9 | 28.7 | 18.9 | 51.5 | 44.6 | 33.3 | 28.1 | 54.42 | 46.5 |
| Total hospital days, mean, yrs. (SD) | 5.0 (9.6) | 4.1 (8.6) | 12.3 (16.8) | 10.9 (15.3) | 1.9 (5.4) | 1.9 (5.2) | 2.1 (5.6) | 1.4 (4.3) | 6.7 (11.5) | 5.6 (10.4) | 2.7 (6.3) | 2.5 (6.0) | 6.4 (10.4) | 5.6 (9.8) |
| Comorbidity | ||||||||||||||
| ASHD | 31.4 | 32.8 | 34.9 | 39.9 | 24.0 | 26.5 | 25.4 | 21.6 | 34.0 | 36.2 | 26.8 | 29.2 | 35.2 | 37.4 |
| CHF | 29.0 | 29.4 | 42.9 | 46.0 | 19.3 | 22.4 | 20.4 | 16.5 | 33.4 | 34.4 | 22.9 | 24.3 | 33.3 | 34.5 |
| CVA/TIA | 10.3 | 11.6 | 12.1 | 12.3 | 6.6 | 8.4 | 6.9 | 5.2 | 11.1 | 13.0 | 8.2 | 9.6 | 12.3 | 14.4 |
| PVD | 24.0 | 26.6 | 31.3 | 34.5 | 16.1 | 20.0 | 18.7 | 19.0 | 26.9 | 29.3 | 19.6 | 23.1 | 27.5 | 31.1 |
| Other cardiac | 21.5 | 19.6 | 35.8 | 35.8 | 14.6 | 13.9 | 14.0 | 10.6 | 25.7 | 23.9 | 16.1 | 15.0 | 24.8 | 23.6 |
| COPD | 12.8 | 16.0 | 18.0 | 25.3 | 8.0 | 11.4 | 9.3 | 9.6 | 15.0 | 18.5 | 9.8 | 13.4 | 14.9 | 18.8 |
| GI bleeding | 6.5 | 6.0 | 16.3 | 18.5 | 2.8 | 2.8 | 2.8 | 2.1 | 8.2 | 8.0 | 3.6 | 3.5 | 8.3 | 8.0 |
| Liver disease | 7.8 | 6.0 | 13.8 | 11.9 | 7.5 | 4.9 | 6.7 | 5.3 | 8.7 | 6.1 | 6.7 | 5.8 | 8.1 | 6.3 |
| Dysrhythmia | 19.6 | 23.9 | 27.4 | 34.0 | 15.2 | 19.4 | 15.3 | 17.2 | 22.3 | 27.1 | 16.2 | 21.0 | 21.8 | 26.5 |
| Cancer | 5.4 | 6.0 | 9.3 | 13.2 | 4.8 | 5.1 | 3.6 | 3.1 | 6.1 | 7.5 | 4.3 | 4.8 | 5.9 | 6.6 |
| Diabetes | 55.0 | 61.1 | 51.1 | 57.0 | 53.0 | 61.5 | 51.7 | 49.4 | 55.5 | 62.9 | 53.6 | 59.9 | 56.3 | 62.8 |
Unless otherwise indicated, data are percentages. LL = consistently low; LI = low-intermediate; LH = low-high; HH = consistently high; IH = intermediate-high; II = consistently intermediate; ASHD = atherosclerotic heart disease; CHF = congestive heart failure; COPD = chronic obstructive heart disease; CVA/TIA = cerebrovascular accident/transient ischemic attack; ESRD = end-stage renal disease; GI = gastrointestinal; PVD = peripheral vascular disease.