Development of an Open-Heart Intraoperative Risk Scoring Model for Predicting a Prolonged Intensive Care Unit Stay

Table 3

Risk factors associated with a prolonged length of ICU stay from multivariate logistic regression analysis and the OHIR score.

Variable outcomes	Regression coefficient	Adjusted OR	95% CI	𝑃 value
Age (≥60 years)	0.974	2.648	1.217–5.762	0.014
P/F ratio (≤200 mmHg)	0.857	2.357	1.048–5.301	0.038
Platelet count (≤120,000/mm^3)	0.847	2.333	1.011–5.383	0.047
Inotropic drugs (≥2 items)	1.593	4.920	2.212–10.943	<0.001
Potassium level (≤3.2 mEq/L)	0.910	2.485	0.965–6.394	0.059
Atrial fibrillation (grading ≥2)	0.934	2.545	1.196–5.418	0.015
Constant	−2.576	0.076	—	<0.001

ICU: intensive care unit; OHIR: Open-Heart Intraoperative Risk; OR: odds ratio; CI: confidence intervals.