Table 1.
Characteristics of the study cohort: 4,324 HD patients with CABG surgery as selected on the basis of baseline measures
| Propensity score quartile | 1st | 2nd | 3rd | 4th | P value | ||||
|---|---|---|---|---|---|---|---|---|---|
| Cardiac rehabilitation (yes/no) | Y | N | Y | N | Y | N | Y | N | |
| size | 79 | 1001 | 147 | 934 | 194 | 888 | 287 | 794 | |
| Age >= 65 yr (%) | 57 | 67 | 68 | 69 | 75 | 68 | 72 | 67 | 0.18 |
| Male (%) | 39 | 50 | 73 | 69 | 82 | 78 | 91 | 93 | 0.90 |
| Race (%) | 1.00 | ||||||||
| Asian | 6 | 5 | 3 | 3 | 2 | 2 | 0 | 0 | |
| black | 37 | 30 | 16 | 16 | 4 | 7 | 2 | 2 | |
| Native American | 1 | 2 | 1 | 2 | 3 | 1 | 1 | 2 | |
| white | 56 | 63 | 79 | 78 | 91 | 89 | 96 | 96 | |
| Other | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | |
| Medicaid coveragea (%) | 33 | 29 | 14 | 15 | 5 | 5 | 0 | 1 | 0.98 |
| No. of cardiovascular conditionsa (mean) | 1.2 | 1.4 | 1.4 | 1.3 | 1.4 | 1.3 | 1.3 | 1.2 | 0.45 |
| Hemoglobina (g/dl; mean) | 9.7 | 9.8 | 10.1 | 9.9 | 10.0 | 10.0 | 10.0 | 10.1 | 0.97 |
| Serum albuminaa (g/dl; mean) | 3.1 | 3.1 | 3.1 | 3.1 | 3.2 | 3.2 | 3.3 | 3.3 | 0.73 |
| Diabetic ESRDa (%) | 61 | 57 | 56 | 55 | 49 | 47 | 30 | 35 | 0.86 |
| AMI before CABG (%) | 41 | 50 | 43 | 42 | 35 | 36 | 21 | 20 | 0.69 |
| COPDa (%) | 6 | 8 | 12 | 8 | 5 | 9 | 8 | 7 | 0.88 |
| Vintage (mo; mean) | 17.4 | 13.8 | 13.0 | 14.5 | 12.3 | 14.4 | 14.4 | 15.1 | 0.29 |
| Hospital stays after CABG (d; mean) | 14.4 | 16.7 | 14.0 | 13.8 | 12.9 | 12.6 | 9.7 | 9.5 | 0.83 |
| Discharge to self care / outpatient (%) | 35 | 35 | 46 | 42 | 49 | 52 | 59 | 56 | 0.53 |
| Initial Medicare expenditureb ($; mean) | 26,579 | 27,341 | 24,797 | 24,714 | 18,729 | 19,283 | 14,736 | 14,551 | 0.69 |
a
Measured at HD start
b
accumulated during the 6-month entry period.
Abbreviations: ESRD, end-stage renal disease; CABG, coronary artery bypass grafting; HD, hemodialysis; AMI, acute myocardial infarction; COPD, chronic obstructive pulmonary disease