Cerebral oxygen saturation after multiple perioperative influential factors predicts the occurrence of postoperative cognitive dysfunction

Table 4 Neuropsychological test scores of non-POCD and POCD groups before and 6 days after surgery

	Baseline		6 days after surgery
	Non-POCD (n = 63)	POCD (n = 15)	Non-POCD (n = 63)	POCD (n = 15)
MMSE	28.10 ± 1.54	27.73 ± 1.79	27.51 ± 1.86	25.33 ± 1.54^, **
Digital span test	13.16 ± 2.82	12.93 ± 2.19	12.75 ± 2.38	10.13 ± 2.47^, **
Word recognition memory test	2.22 ± 0.48	2.38 ± 0.47	2.40 ± 0.48	3.16 ± 0.43^,**
Digit symbol substitution test	31.71 ± 4.07	31.47 ± 4.58	30.54 ± 4.98	27.60 ± 6.03
Trail making test A (s)	41.02 ± 4.57	40.93 ± 3.90	42.10 ± 5.29	45.20 ± 6.46**
Stroop color word interference	38.94 ± 4.04	38.80 ± 3.69	37.37 ± 5.40	30.47 ± 6.09^, **
Verbal fluency test	18.62 ± 2.96	18.20 ± 3.10	17.56 ± 3.17	12.80 ± 3.80^, **

*P < 0.01 in comparison with non-POCD group; **P < 0.05, ***P < 0.01 in comparison with baseline of either group. Digit span test = forward score + backward score

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