Table 2.
Characteristics of the Study Population by RDW Group*
| Characteristics | Normal RDW (n = 402) |
High RDW (n = 101) |
p |
|---|---|---|---|
| Demographics | |||
| Age (y) | 65 ± 13 | 67 ± 14 | 0.091 |
| Male | 233 (58%) | 47 (47%) | 0.039 |
| Race | 0.772 | ||
| Caucasian | 89 (22%) | 17 (17%) | |
| Black | 48 (12%) | 15 (15%) | |
| Hispanic | 142 (35%) | 36 (35%) | |
| Asian | 31 (8%) | 9 (9%) | |
| Other | 92 (23%) | 24 (24%) | |
| Laboratory Measurements | |||
| WBC (1,000/µL) | 8 ± 3 | 8 ± 4 | 0.548 |
| Hemoglobin (g/dL) | 13 ± 2 | 11 ± 2 | <0.001 |
| Platelets (1,000/µL) | 240 ± 71 | 263 ± 131 | 0.017 |
| Tn Max (ng/mL) | 0.01 (0.00–0.10) | 0.02 (0.00–0.28) | 0.053 |
| Creatinine (mg/dL) | 1.0 (0.8–1.3) | 1.2 (0.8–1.8) | 0.002 |
| Anemia | 146 (36%) | 78 (77%) | <0.001 |
| Angiographic Findings | 0.066 | ||
| Normal or non obstructive disease | 130 (32%) | 37 (36%) | |
| 1 vessel-disease | 97 (24%) | 12 (12%) | |
| 2 vessel-disease | 69 (17%) | 20 (20%) | |
| ≥ 3 vessel-disease | 106 (27%) | 32 (32%) | |
| Medical History | |||
| Heart Failure | 123 (31%) | 50 (50%) | <0.001 |
| CAD | 237 (59%) | 50 (50%) | 0.086 |
| HTN | 314 (78%) | 78 (77%) | 0.849 |
| Diabetes | 172 (43%) | 46 (46%) | 0.617 |
| Dyslipidemia | 192 (48%) | 36(36%) | 0.029 |
| Smoking | 129 (32%) | 26 (26%) | 0.217 |
| FHx | 94 (23%) | 12 (12%) | 0.011 |
| Prior Interventions | |||
| Previous CABG | 58 (14%) | 14 (14%) | 0.884 |
| Previous PCI | 113 (28%) | 26 (26%) | 0.634 |
| Diagnosis | 0.320 | ||
| UA | 328 (82%) | 78 (77%) | |
| NSTEMI | 74 (18%) | 23 (23%) | |
| Treatment | 0.037 | ||
| Medical Therapy only | 212 (53%) | 58 (57%) | |
| PCI | 153 (38%) | 27 (27%) | |
| CABG | 37 (9%) | 16 (16%) |
*
n = 503. Continuous variables are reported as mean ± standard deviation if normally distributed, median (range) if not. Categorical variables are reported as frequency (percentage). WBC = White Blood Cell count; Tn Max = Maximal Troponin I; CAD = Coronary Artery Disease; HTN = Hypertension; FHx = Family History of Coronary Artery Disease; CABG = Coronary Artery Bypass Graft; PCI = Percutaneous Coronary Intervention; UA = Unstable Angina; NSTEMI = Non ST Elevation Myocardial Infarction. P values<0.05 are in boldface.