Table 1. Univariate associations between leukocytosis and baseline characteristics.
| Variable | WBC<11k | WBC> = 11k | n | p-value | |||
|---|---|---|---|---|---|---|---|
| n | n | ||||||
| 10116 | 863 | 10979 | |||||
| Age | 65.644 | 12.621 | 63.563 | 12.758 | 10979 | <0.001 | * |
| Creatinine | 1.115 | 0.808 | 1.184 | 0.932 | 10931 | 0.038 | * |
| Sex (male) | 6855/10096 | 67.9% | 579/858 | 67.5% | 10954 | 0.832 | |
| ASA Grade 3 or Greater | 9937/10102 | 98.4% | 853/860 | 99.2% | 10962 | 0.087 | |
| Obesity (BMI>30) | 3831/9968 | 38.4% | 354/841 | 42.1% | 10809 | 0.040 | * |
| Diabetes | 2698/10116 | 26.7% | 263/863 | 30.5% | 10979 | 0.017 | * |
| Hypertension | 7735/10116 | 76.5% | 647/863 | 75.0% | 10979 | 0.343 | |
| Tobacco smoker | 1717/10116 | 17.0% | 306/863 | 35.5% | 10979 | <0.001 | * |
| Alcohol consumption | 454/10116 | 4.5% | 42/863 | 4.9% | 10979 | 0.668 | |
| Dyspnea | 5397/10116 | 53.4% | 400/863 | 46.3% | 10979 | <0.001 | * |
| Angina | 3546/10116 | 35.1% | 365/863 | 42.3% | 10979 | <0.001 | * |
| Emergency Procedure | 596/10116 | 5.9% | 203/863 | 23.5% | 10979 | <0.001 | * |
| History of COPD | 836/10116 | 8.3% | 116/863 | 13.4% | 10979 | <0.001 | * |
| History of CHF | 1288/10116 | 12.7% | 151/863 | 17.5% | 10979 | <0.001 | * |
| History of MI | 1659/10116 | 16.4% | 267/863 | 30.9% | 10979 | <0.001 | * |
| History of PVD | 335/10116 | 3.3% | 35/863 | 4.1% | 10979 | 0.287 | |
| Previous Cardiac Procedure | 3091/10116 | 30.6% | 252/863 | 29.2% | 10979 | 0.428 | |
Univariate associations between leukocytosis (>11,000 white blood cell count per microliter) and baseline characteristics. Continuous variables are expressed as a mean and standard deviation, while categorical variables are expressed as a proportion and a percentage. BMI = Body Mass Index; COPD = Chronic Obstructive Pulmonary Disease; CHF = Congestive Heart Failure; MI = Myocardial Infarction; PVD = Peripheral Vascular Disease.
* indicates statistically significant p-values at the 0.05 significance level.