表 2. Comparison of baseline data between the PND and non-PND groups for the modeled cohort.

建模队列的PND组和非PND组基线资料对比

Index	PND group (n = 42)	Non-PND group (n = 103)	χ2/t	P
The abbreviations in the table are the same as those in Table 1.
Sex/case (%)			0.163	0.687
Male	25 (59.52)	65 (63.11)
Female	17 (40.48)	38 (36.89)
Age/yr.	69.27 ± 6.54	62.36 ± 4.93	6.937	< 0.001
BMI/(kg/m2)	21.05 ± 1.63	20.98 ± 1.48	0.251	0.802
ASA classify/case (%)			0.695	0.404
< Ⅲ classify	18 (42.86)	52 (50.49)
Ⅲ classify	24 (57.14)	51 (49.51)
Tumor location/case (%)			0.394	0.942
Colon ascendens	15 (35.71)	42 (40.78)
Colon transversum	3 (7.14)	8 (7.77)
Colon descendens	6 (14.29)	13 (12.62)
Colon sigmoideum	18 (42.86)	40 (38.83)
Degree of tumor differentiation/case (%)			0.118	0.906
Well-differentiated	2 (4.76)	6 (5.83)
Moderately differentiated	22 (52.38)	51 (49.51)
Poorly differentiated	18 (42.86)	46 (44.66)
Tumor histological type/case (%)			0.571	0.568
Adenocarcinoma	36 (85.71)	84 (81.55)
Mucinous adenocarcinoma	4 (9.52)	14 (13.59)
Other	2 (4.76)	5 (4.85)
Operation time/min	198.37 ± 54.79	180.21 ± 47.61	1.993	0.048
Wake up time/min	28.69 ± 7.25	29.31 ± 7.18	0.470	0.639
Depth of anesthesia/case (%)			6.403	0.011
40-50	26 (61.90)	40 (38.83)
50-60	16 (38.10)	63 (61.17)
Intraoperative infusion volume/mL	833.62 ± 136.01	827.96 ± 151.32	0.210	0.834
Intraoperative bleeding/mL	77.95 ± 16.97	72.21 ± 13.24	2.176	0.031
Mean intraoperative rSO2/%	62.24 ± 2.98	66.98 ± 3.61	7.524	< 0.001
Postoperative analgesic protocol/case (%)			10.852	< 0.001
Oral pain medication	31 (73.81)	45 (43.69)
Analgesic pump	11 (26.19)	58 (46.31)
MPV/fL	11.59 ± 0.74	10.32 ± 0.96	7.687	< 0.001
PDW/fL	17.67 ± 0.82	15.54 ± 0.59	17.518	< 0.001
HB/(g/L)	113.65 ± 19.87	110.97 ± 21.63	0.692	0.490
RBC/×109 L－1	4.42 ± 0.41	4.36 ± 0.52	0.668	0.506
VAS/score	3.39 ± 1.37	2.14 ± 1.29	5.198	< 0.001
PSQI/score	7.25 ± 2.60	5.26 ± 1.31	6.112	< 0.001
Preoperative MMSE/score	28.02 ± 0.98	27.94 ± 1.06	0.421	0.674