Table 2:
Cohort Demographics
| Variable | Total (n=24813) | Low Risk (n=12770) | High Risk (n=12043) | P-value |
|---|---|---|---|---|
| Male | 20155 (81%) | 10337 (81%) | 9818 (82%) | 0.139 |
| Median Age (IQR) | 74 (68–81) | 74 (68–80) | 75 (68–80) | 0.1793 |
| Current Smoker | 7525 (30%) | 3688 (29%) | 3787 (32%) | <0.001 |
| Non-independent Functional status | 930 (4%) | 373 (3%) | 557 (5%) | <0.001 |
| Preoperative transfusion (>1 units within 72 hours) | 110 (.44%) | 45 (.35%) | 65 (.54%) | 0.026 |
| DNR Status | 67 (.43%) | 15 (.23%) | 52 (.57%) | 0.001 |
| Alcohol | 682 (4%) | 307 (5%) | 375 (4%) | 0.084 |
| Diabetes | 3893 (16%) | 1726 (14%) | 2131 (18%) | <0.001 |
| Bleeding Disorder | 2823 (11%) | 1113 (9%) | 1710 (14%) | <0.001 |
| Steroid Use | 1010 (4%) | 359 (3%) | 651 (5%) | <.0.001 |
| Weight loss | 290 (1.17%) | 171 (1.42%) | 119 (0.93%) | <0.001 |
| Preoperative Albumin | <0.001 | |||
| Abnormal | 2323 (9%) | 998 (8%) | 1325 (11%) | |
| Normal | 9786 (39%) | 5014 (39%) | 4772 (40%) | |
| Normal | 9786 (39%) | 5014 (39%) | 4772 (40%) | |
| Missing | 12704 (51%) | 6770 (53%) | 5934 (49%) | |
| Preoperative Hematocrit | <0.001 | |||
| Abnormal | 7816 (32%) | 3607 (28%) | 4209 (35%) | |
| Normal | 16252 (61%) | 8758 (69%) | 7494 (62%) | |
| Missing | 745 (3%) | 417 (3%) | 328 (3%) | |
| Preoperative Creatinine | <0.001 | |||
| Abnormal | 9100 (37%) | 4166 (33%) | 4934 (41%) | |
| Normal | 15023 (61%) | 8230 (64%) | 6793 (56%) | |
| Missing | 690 (3%) | 386 (3%) | 304 (3%) | |
IQR: Interquartile Range, DNR: Do Not Resuscitate Status
Categoric data are shown as number (%) and continuous data as median (interquartile range)
Normal lab values are defined as the following: Albumin: 3.5–5.5 g/dL; Creatinine: 0.6–1.2 mg/dL in males, 0.5–1.1 mg/dL in females; Hematocrit: 38.8%−50% in males, 34.9%−44.5% in females.
Univariate comparisons for continuous variables made with Student’s t-test; comparisons for categorical variables made using Pearson’s chi-squared test or Fisher’s exact test, as appropriate.