Table 5.

Multivariable logistic regression model for AKI using Firth’s bias correction.

Independent variable	Odds ratio [95% Confidence interval]	P-value
Sex (male vs. female)	0.193 [0.023, 1.611]	0.1285
Coronary heart disease (yes vs. no)	1.172 [0.167, 8.220]	0.8734
Hypertension (yes vs. no)	0.662 [0.080, 5.501]	0.7023
Surgery (open vs endo)	2.882 [0.468, 17.725]	0.2535
SLPI 12 h after ICU, ng/ml	1.055 [1.009, 1.103]	0.0181

All patient characteristics from Table 1 with a P-value <0.2 in the univariable logistic regression model, the type of surgery and the SLPI measurement with the smallest P-value were taken as independent variables.