Table 2.
Variable selection of stepwise logistic regression model.
| Variables | OR [95% CI] | P-value |
|---|---|---|
| Demographic characteristics | ||
| Gender female | 0.65 [0.48, 0.88] | 0.006 |
| BMI | 0.97 [0.95, 0.99] | 0.012 |
| Elective surgical types | ||
| Neurosurgery | 2.53 [1.57, 4.04] | <0.001 |
| Thoracic surgery | 1.91 [0.93, 3.71] | 0.065 |
| Comorbidities | ||
| Cardiac arrhythmias | 1.31 [0.97, 1.78] | 0.079 |
| Peripheral vascular diseases | 1.61 [1.14, 2.25] | 0.006 |
| Coagulopathy | 2.36 [1.49, 3.68] | <0.001 |
| Digestive disorders | 2.36 [1.66, 3.34] | <0.001 |
| Anemia | 0.68 [0.46, 0.98] | 0.044 |
| Mechanical ventilation | 0.71 [0.46, 1.11] | 0.133 |
| Prognostic scoring system | ||
| SOFA | 1.08 [1.01, 1.16] | 0.027 |
| SAPS II | 1.04 [1.02, 1.06] | <0.001 |
| OASIS | 1.05 [1.03, 1.08] | <0.001 |
| GCS | 1.10 [1.04, 1.17] | <0.001 |
| Vital signs | ||
| Maximum systolic BP | 0.99 [0.99, 1.00] | 0.12 |
| Mean diastolic BP | 0.94 [0.91, 0.98] | 0.001 |
| Mean BP | 1.04 [1.00, 1.08] | 0.027 |
| Mean respiratory rate | 1.03 [1.00, 1.07] | 0.076 |
| Laboratory findings | ||
| Maximum WBC | 0.97 [0.93, 1.00] | 0.067 |
| Minimum WBC | 1.06 [1.01, 1.11] | 0.015 |
| Minimum BUN | 1.01 [1.00, 1.02] | 0.097 |
| Maximum creatinine | 0.63 [0.39, 0.98] | 0.052 |
| Minimum creatinine | 1.50 [0.90, 2.57] | 0.127 |
| Maximum INR | 1.16 [0.97, 1.40] | 0.085 |
| Minimum INR | 1.75 [1.15, 2.70] | 0.009 |
| Maximum APTT | 1.01 [1.00, 1.01] | 0.008 |
| Maximum PT | 0.96 [0.92, 1.00] | 0.043 |
| Maximum sodium | 1.08 [1.03, 1.13] | 0.002 |
| Minimum potassium | 0.78 [0.58, 1.06] | 0.115 |
| Maximum chloride | 0.96 [0.92, 0.99] | 0.025 |
| Maximum PO2 (with every 10% increment) | 0.98 [0.96, 0.99] | <0.001 |
| Mean PCO2 | 0.93 [0.90, 0.97] | <0.001 |
| Maximum SpO2 | 0.78 [0.66, 0.91] | 0.002 |
| Minimum SpO2 | 1.02 [1.00, 1.03] | 0.001 |
| Minimum pH (with every 0.1 increment) | 0.51 [0.35, 0.75] | 0.001 |
| Minimum BE | 1.10 [1.02, 1.18] | 0.015 |
OR, odds ratio; BMI, body mass index; SOFA, sequential organ failure assessment; SAPS II, Simplified Acute Physiology Score II; OASIS, Oxford Acute Severity of Illness Score; GCS, Glasgow Coma Scale; BP, blood pressure; WBC, white blood cell count; BUN, blood urea nitrogen; INR, international normalized ratio; APTT, activated partial thromboplastin time; PT, prothrombin time; PO2, partial pressure of arterial oxygen; PCO2, partial pressure of arterial carbon dioxide; SpO2, Oxygen saturation; pH, potential hydrogen; BE, base excess.