Table 6.

Variables	B**	Standard deviation	Wald***	Sig.****	Exp(B)*****
Skull base/Falx tumor	1.036	0.523	3.919	0.048	2.817
Size > 4cm	0.969	0.425	5.200	0.023	2.635
Preoperative KPS*	0.143	0.026	29.530	0.000	1.154
Constant******	-13.367	2.234	35.818	0.000	0.000

* Karnofsky performance status scale

Binary logistic regression. The presence of the following factors is associated with an increased likelihood of exhibiting a deterioration in the patient’s postoperative state (negative Kd score): skull base/falx tumor (in comparison to convexity tumor), tumor size greater than 4cm or an increasing preoperative KPS value.

** regression coefficient B (means b1 in regression equation)

*** Wald test to verify the significance of each predictor/variable

**** p value

***** Exp(B) value reflects the respective de-logarithmic coefficient (b1) as an odds ratio

****** the constant (b0) in the regression equation