Table 1.
Selected patient demographic and operative variables for 235,394 study patients before and after propensity score adjustment using inverse probability weighting
| Before Propensity Score Adjustment |
After Propensity Score Adjustment |
|||
|---|---|---|---|---|
| Variable | Endoscopic Harvest |
Open Harvest | Endoscopic Harvest |
Open Harvest |
| Number of patients | 122,899 | 112,495 | 122,899 | 112,495 |
| Age in years (SD) | 73.6 (5.70) | 73.6 (5.67) | 73.6 (5.69) | 73.6 (5.68) |
| Female | 30.7 | 32.3 | 31.4 | 31.5 |
| Race | ||||
| White | 90.1 | 89.0 | 89.6 | 89.6 |
| Black | 4.3 | 4.3 | 4.3 | 4.3 |
| Asian | 1.1 | 1.2 | 1.1 | 1.1 |
| Other | 2.9 | 3.2 | 3.1 | 3.1 |
| Ethnicity: Hispanic | 1.5 | 2.3 | 1.9 | 1.9 |
| Height in cm (SD) | 170.7 (10.9) | 170.4 (10.9) | 170.6 (10.89) | 170.6 (10.83) |
| BMI in kg/m2 (SD) | 28.5 (5.36) | 28.4 (5.30) | 28.5 (5.32) | 28.5 (5.32) |
| Peripheral vascular disease | 17.9 | 18.0 | 18.0 | 17.9 |
| Current smoker | 13.9 | 13.5 | 13.7 | 13.7 |
| Dyslipidemia | 78.4 | 74.4 | 76.4 | 76.4 |
| Hypertension | 84.5 | 82.7 | 83.6 | 83.6 |
| Non-insulin dependent diabetes mellitus | 27.6 | 27.2 | 27.4 | 27.4 |
| Insulin dependent diabetes mellitus | 10.9 | 9.9 | 10.0 | 10.0 |
| Immunosuppressive treatment | 2.3 | 2.1 | 2.2 | 2.2 |
| Atrial fibrillation | 6.8 | 7.2 | 7.0 | 7.0 |
| History of stroke or TIA | 12.5 | 12.2 | 12.4 | 12.4 |
| History of CHF | 14.4 | 15.2 | 14.8 | 14.8 |
| Preoperative dialysis | 1.5 | 1.5 | 1.5 | 1.5 |
| Unstable angina | 25.5 | 25.3 | 25.4 | 25.4 |
| Previous MI within 24 hrs. | 1.6 | 1.5 | 1.5 | 1.5 |
| Any prior PCI | 18.8 | 18.2 | 18.5 | 18.5 |
| Preoperative IABP or inotrope | 5.4 | 6.1 | 5.8 | 5.8 |
| Procedure status: elective | 51.1 | 50.8 | 51.0 | 51.1 |
| Procedure status: urgent | 48.9 | 49.2 | 49.0 | 48.9 |
| Preoperative shock | 0.58 | 0.70 | 0.65 | 0.64 |
| Left main coronary artery disease |
33.4 | 31.9 | 32.6 | 32.6 |
| Diseased coronary vessel: <2 | 1.5 | 1.9 | 1.7 | 1.7 |
| Diseased coronary vessel: 2 | 17.1 | 18.4 | 17.8 | 17.7 |
| Diseased coronary vessel: 3 | 81.4 | 79.7 | 80.5 | 80.6 |
| Academic center location | 11.8 | 9.7 | 10.6 | 10.6 |
| Geographic region | ||||
| Midwest | 29.7 | 38.1 | 33.8 | 33.8 |
| Northeast | 14.6 | 12.6 | 13.6 | 13.6 |
| South | 43.8 | 35.0 | 39.3 | 39.5 |
| West | 11.9 | 14.3 | 13.2 | 13.1 |
| Surgical year | ||||
| 2003 | 9.0 | 24.1 | 16.4 | 16.3 |
| 2004 | 13.3 | 19.9 | 16.5 | 16.5 |
| 2005 | 17.0 | 17.0 | 17.0 | 17.0 |
| 2006 | 19.5 | 14.8 | 17.2 | 17.2 |
| 2007 | 19.9 | 12.9 | 16.6 | 16.6 |
| 2008 | 21.1 | 11.3 | 16.4 | 16.4 |
Abbreviation: CABG, coronary artery bypass grafting; MI, myocardial infarction; IABP, intra-aortic balloon pump; SD, standard deviation; BMI, body mass index; CHF, congestive heart failure; PCI, percutaneous coronary intervention; GFR, glomerular filtration rate.