Table 3. Univariate logistic regression with infection as the outcome.
Each variable was tested as to whether or not they were associated with infection. Odds ratios (OR) and confidence intervals (CI), and p-values are reported. If the OR is greater than 1, it indicates that there is an increased chance of the event occurring (infection) for that variable or variable level. If the OR is less than 1, it means that the variable or variable level was less likely to be associated with the event. A p-value less than 0.05 is considered to be significant.
COPD: chronic obstructive pulmonary disease; CABG: coronary artery bypass graft surgery; VR: valvular replacement; PRBC: packed red blood cells; INR: international normalized ratio; PT: prothrombin time; aPTT: activated partial thromboplastin time; HbA1c, hemoglobin A1C; LOS: length of stay
| Characteristic | N | OR | 95% CI | P-value |
| Gender | 364 | |||
| Female | — | — | ||
| Male | 0.63 | 0.40, 1.02 | 0.059 | |
| Age | 364 | 1.01 | 1.00, 1.03 | 0.14 |
| Weight | 364 | 0.99 | 0.98, 1.01 | 0.4 |
| Height | 364 | 0.05 | 0.00, 0.63 | 0.021 |
| Body mass index | 363 | 1.01 | 0.97, 1.05 | 0.6 |
| Smoking | 364 | |||
| No | — | — | ||
| Yes | 0.79 | 0.45, 1.35 | 0.4 | |
| Type 2 diabetes | 364 | |||
| No | — | — | ||
| Yes | 2.23 | 1.36, 3.74 | 0.002 | |
| COPD | 364 | |||
| No | — | — | ||
| Yes | 1.03 | 0.14, 5.35 | >0.9 | |
| Heart failure | 364 | |||
| No | — | — | ||
| Yes | 3.81 | 1.96, 7.59 | <0.001 | |
| Hypertension | 364 | |||
| No | — | — | ||
| Yes | 1.83 | 1.14, 2.97 | 0.013 | |
| Dyslipidemia | 364 | |||
| No | — | — | ||
| Yes | 1.05 | 0.67, 1.64 | 0.8 | |
| Operation | 364 | |||
| CABG | — | — | ||
| CABG + VR | 1.01 | 0.42, 2.33 | >0.9 | |
| Other | 0.34 | 0.08, 1.04 | 0.09 | |
| VR | 0.89 | 0.51, 1.52 | 0.7 | |
| Duration of surgery | 363 | 1 | 1.00, 1.00 | 0.4 |
| Preop hemoglobin | 363 | 0.86 | 0.76, 0.95 | 0.006 |
| Antibiotic | 364 | |||
| 2 gm cefazolin | — | — | ||
| 2 gm cefazolin + gentamicin | 0.81 | 0.28, 2.06 | 0.7 | |
| Postop hemoglobin | 364 | 0.91 | 0.78, 1.04 | 0.2 |
| Hemoglobin at discharge | 364 | 0.96 | 0.83, 1.12 | 0.6 |
| Preop creatinine | 364 | 1 | 1.00, 1.00 | 0.7 |
| Postop creatinine | 364 | 1 | 1.00, 1.00 | 0.3 |
| HbA1c | 364 | 1.24 | 1.12, 1.39 | <0.001 |
| Transfusion | 364 | |||
| No | — | — | ||
| Yes | 1.64 | 0.84, 3.39 | 0.2 | |
| PRBC transfusion | 363 | |||
| No | — | — | ||
| Yes | 1.58 | 0.83, 3.18 | 0.2 | |
| PRBC transfusion amount | 364 | 1.09 | 1.01, 1.19 | 0.028 |
| Platelet transfusion | 364 | |||
| No | — | — | ||
| Yes | 0.99 | 0.58, 1.67 | >0.9 | |
| Preop INR | 364 | 0.96 | 0.25, 3.35 | >0.9 |
| Postop INR | 364 | 0.97 | 0.36, 2.32 | >0.9 |
| Preop PT | 364 | 1.01 | 0.90, 1.11 | 0.9 |
| Postop PT | 364 | 1 | 0.91, 1.07 | >0.9 |
| Preop aPTT | 364 | 1.02 | 1.00, 1.04 | 0.036 |
| Postop aPTT | 364 | 1.01 | 0.99, 1.02 | 0.4 |
| LOS | 364 | 1.07 | 1.04, 1.11 | <0.001 |