A high risk of sleep apnea is associated with less postoperative cognitive dysfunction after intravenous anesthesia: results of an observational pilot study

Table 3 Change of cognitive functions, expressed as the difference between post- and preoperative values

Test	Control	OSAS	P_MWU	P_ANOVA
DemTect (points)	−4 (−8–0)	0 (− 4–6)	< 0.0001	< 0.0001, 0.56
RBMT (points)	−15 (− 25–25)	5 (−9–16)	< 0.0001	< 0.0001, 0.91
ZVT (min)	− 0.17 (− 1.55–0.29)	−0.16 (− 0.63–0.29)	1.00	0.26, 0.32
TMT (min)	0.19 (−1.44–0.79)	- 0.11 (− 1.67–1.16)	0.049	0.37, 0.35
Digit Span Forwards (points)	−1 (− 6–2)	1 (− 2–3)	0.0013	0.0010, 0.74
Digit Span Backwards (points)	−1 (− 4–3)	2 (−3–5)	0.0025	0.0019, 0.91
SKT (points)	3 (−3–6)	1 (− 6–5)	0.0022	0.026, 0.31
FWIT (min)	0.03 (−0.18–0.26)	−0.02 (− 0.23–0.33)	0.055	0.28, 0.59

Data are reported as median (range). P_MWU is the significance level of the difference between the two groups obtained by the Mann-Whitney test. P_ANOVA are the significance levels of the factors “group” and “gender” obtained by analysis of variance

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