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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: World Neurosurg. 2012 Nov 24;81(1):165–172. doi: 10.1016/j.wneu.2012.11.068

Table 5.

Patient and Operative Variables Predictive of a Need for ICU Care Other than Intravenous Blood Pressure Medication Drips – Univariate Analysis.

Variable Test Performed P Value Odds Ratio (95% Conf. Int.)
Inpatient Status Fisher’s Exact Test 0.17 Inpatient: 1.745 (0.844 – 3.610)
Sex Fisher’s Exact Test 0.064 Male: 2.031 (0.987 – 4.178)
Type (tumor, vascular,
functional, congenital,
autoimmune, or infectious)
Chi-Square 0.99 Tumor (against all others): 1.232 (0.569 – 2.668)
Vascular (against all others): 0.943 (0.375 – 2.371)
Functional (against all others): 0.734 (0.215 – 2.506)
Congenital (against all others): 0.925 (0.116 – 7.340)
Supra- vs. Infra-tentorial Fisher’s Exact Test 1.00 Supratentorial: 1.076 (0.469 – 2.467)
Anesthesia (General vs. Awake) Fisher’s Exact Test 1.00 General: 1.175 (0.149 – 9.275)
Re-do cases Fisher’s Exact Test 0.61 Re-do: 1.261 (0.498 – 3.195)
ASA Status Chi-Square 0.0008 Classes 3 & 4 (against 1 & 2): 4.636 (2.083 – 10.318)
Diabetes Fisher’s Exact Test 0.0014 Diabetes: 4.545 (1.927 – 10.753)
Active tobacco smoking Fisher’s Exact Test 1.00 Smoker: 0.800 (0.270 – 2.365)
OR blood products Fisher’s Exact Test 0.0019 OR blood product use: 4.000 (1.764 – 9.091)
ICU stay over past 12-months Fisher’s Exact Test 1.00 Prior ICU stay: 1.040 (0.239 – 3.096)
Age Wilcoxon Rank-Sum Test 0.060 Per year of age: 1.026 (1.002 – 1.051)
EBL Wilcoxon Rank-Sum Test 0.015 Per ml of blood loss: 1.001 (1.000 – 1.002)
BMI Wilcoxon Rank-Sum Test 0.35 Per integer increase in BMI: 1.067 (1.013 – 1.123)
Surgery length Wilcoxon Rank-Sum Test 0.0066 Per minute of surgery time: 1.003 (1.001 – 1.005)
Tumor Volume Wilcoxon Rank-Sum Test 0.44 Per CC of tumor volume: 0.998 (0.981 – 1.016)