Table 1.
Demographic and Clinical Characteristics of Study Population, by Level of Hematocrit and Time Period
| 2011q1q2 | 2010q3q4 | 2010q1q2 | 2009q3q4 | 2009q1q2 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| N | 483,131 | 501,245 | 527,329 | 513,026 | 514,478 | |||||
| Hct (%) | ≤36 | >36 | ≤36 | >36 | ≤36 | >36 | ≤36 | >36 | ≤36 | >36 |
| ESA use (%) | 56 | 46 | 57 | 56 | 56.1 | 57.2 | 58.1 | 57.7 | 59.1 | 58.3 |
| Socio-demographics | ||||||||||
| Age, year (SD) | 62.8 (15.1) | 63 (15.1) | 62.8 (15.1) | 63.3 (15.1) | 62.8 (15.1) | 63 (15.1) | 62.8 (15.1) | 63.3 (15.1) | 62.8 (15.1) | 63.3 (15.1) |
| Vintage, year (SD) | 3.5 (2) | 3.5 (2) | 3.5 (2) | 3.5 (2) | 3.5 (2) | 3.5 (2) | 3.5 (2) | 3.5 (2) | 3.5 (2) | 3.5 (2) |
| Male (%) | 54 | 53 | 54 | 53 | 54 | 54 | 54 | 54 | 54 | 53 |
| Race (%) | ||||||||||
| White | 54 | 55 | 55 | 54 | 54 | 55 | 55 | 54 | 55 | 54 |
| Black | 38 | 37 | 37 | 39 | 38 | 37 | 38 | 39 | 38 | 39 |
| Other race | 8 | 8 | 8 | 7 | 8 | 8 | 7 | 7 | 7 | 7 |
| Health insurance (%) | ||||||||||
| Medicare | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 |
| Medicaid | 29 | 28 | 29 | 30 | 29 | 28 | 30 | 30 | 29 | 30 |
| Group coverage | 22 | 22 | 22 | 21 | 22 | 22 | 21 | 20 | 21 | 21 |
| Other coverage | 11 | 11 | 11 | 12 | 11 | 11 | 11 | 11 | 11 | 12 |
| No insurance | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Co-morbidities (%) | ||||||||||
| CHF | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 |
| IHD | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Hypertension | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 |
| Diabetes | 44 | 44 | 45 | 45 | 44 | 44 | 45 | 44 | 44 | 44 |
| Clinical variables | ||||||||||
| Mean Albumin, g/dl (SD) | 2.9 (1) | 2.8 (1) | 3.0 (1) | 3.0 (1) | 2.9 (1) | 2.8 (1) | 3.0 (1) | 3.0 (1) | 3.0 (1) | 3.0 (1) |
| Hemoglobin, g/dl (SD) | 10 (1.7) | 10 (1.7) | 9.9 (1.7) | 9.9 (1.7) | 10 (1.7) | 10 (1.7) | 9.9 (1.7) | 9.9 (1.7) | 9.9 (1.7) | 9.9 (1.7) |
| Body mass index (SD) | 36.7 (6.9) | 36.5 (6.9) | 36.3 (6.9) | 36.5 (6.9) | 36.7 (6.9) | 36.5 (6.9) | 36.3 (6.9) | 36.5 (6.9) | 36.3 (6.9) | 36.5 (6.9) |
Note. All variables in table except for ESA use and Hct (hematocrit) and Vintage are measured at the time the patient begins dialysis. The variable vintage is simply the average number of years since beginning dialysis. Body mass index is measured as the ratio of patient weight (in kg) to the square of patient height (m2). Albumin and hemoglobin are measured in grams per deciliter (g/dl).
CHF, congestive heart failure; IHD, ischemic heart disease.