Table 3.
Variable selection of stepwise logistic regression model
| Variables | OR [95% CI] | P-value |
|---|---|---|
| Demographic characteristics | ||
| BMI | 0.986 [0.979, 0.993] | < 0.001 |
| Age (with each 10 years increment) | 1.269 [1.219, 1.322] | < 0.001 |
| Admission type (unscheduled surgery as reference) | ||
| Internal medicine | 1.526 [1.185, 1.964] | 0.001 |
| Scheduled surgery | 0.936 [0.504, 1.738] | 0.834 |
| Comorbidities | ||
| AIDS | 2.281 [1.343, 3.873] | 0.002 |
| Hematological tumor | 2.279 [1.661, 3.126] | < 0.001 |
| Metastatic cancer | 2.593 [1.858, 3.618] | < 0.001 |
| Vital signs | ||
| Minimum HR (with every 10 beats/min increment) | 1.110 [1.073, 1.147] | < 0.001 |
| Maximum RR | 1.016 [1.009, 1.022] | < 0.001 |
| Minimum RR | 1.022 [1.012, 1.033] | < 0.001 |
| Minimum temperature | 0.811 [0.766, 0.858] | < 0.001 |
| Minimum SBP (with every 10 mmHg increment) | 0.922 [0.880, 0.966] | 0.001 |
| Minimum MAP (with every 10 mmHg increment) | 0.927 [0.872,0.986] | 0.016 |
| Minimum SpO2 | 0.981 [0.976, 0.986] | < 0.001 |
| Laboratory tests | ||
| Minimum PaO2 (with every 10 mmHg increment) | 1.020 [1.005, 1.035] | 0.010 |
| Maximum PaCO2 (with every 10 mmHg increment) | 1.075 [1.041, 1.109] | < 0.001 |
| Minimum PaO2/FiO2 (with every 20 mmHg increment) | 0.940 [0.926, 0.955] | < 0.001 |
| Maximum WBC | 0.989 [0.979, 0.998] | 0.023 |
| Minimum WBC | 1.021 [1.009, 1.034] | 0.001 |
| Minimum platelet (with every 20*1012/L increment) | 0.981 [0.971, 0.992] | 0.001 |
| Maximum hemoglobin | 0.942 [0.918, 0.966] | < 0.001 |
| Minimum bilirubin | 1.073 [1.048, 1.098] | < 0.001 |
| Maximum albumin | 0.679 [0.578, 0.799] | < 0.001 |
| Minimum albumin | 0.848 [0.720, 0.999] | 0.049 |
| Maximum creatinine (with every 0.1 mg/dl increment) | 0.991 [0.987, 0.996] | < 0.001 |
| Minimum BUN | 1.009 [1.006, 1.012] | < 0.001 |
| Minimum sodium (with every 10 mmol/L increment) | 0.900 [0.830, 0.975] | 0.010 |
| Minimum potassium | 1.110 [1.018, 1.211] | 0.019 |
| Maximum lactate | 1.072 [1.043, 1.102] | < 0.001 |
| Minimum lactate | 1.120 [1.067, 1.176] | < 0.001 |
| Maximum PT | 1.013 [1.006, 1.020] | < 0.001 |
| Minimum GCS | 0.943 [0.927, 0.960] | < 0.001 |
| Mechanical ventilation | 1.687 [1.506, 1.891] | < 0.001 |
| Renal replacement therapy | 1.730 [1.274, 2.349] | 0.037 |
| 24 h urine output (with every 200 ml increment) | 0.973 [0.963, 0.983] | < 0.001 |
Abbreviations: OR odds ratio, CI confidence interval, BMI body mass index, HR heart rate, RR respiratory rate, SBP systolic blood pressure, MAP mean arterial pressure, GCS Glasgow Coma Scale, WBC white blood cell count, PT prothrombin time