Effect of dexmedetomidine-ropivacaine transversus abdominis plane block on analgesia and cognitive impairment risk in colorectal cancer surgery

Table 4 Comparison of serum stress hormone levels between two groups

Time point	Group	Cor (nmol/L)	t	P value	AD (ng/mL)	t	P value
1 day before surgery	Observation	295.45 ± 36.25	-0.118	0.906	15.23 ± 3.45	-0.344	0.731
	Control	296.23 ± 35.78			15.45 ± 3.56
6 hours after surgery	Observation	450.32 ± 40.12	-7.973	< 0.001	25.32 ± 4.67	-6.096	< 0.001
	Control	512.67 ± 45.34			30.78 ± 5.12
24 hours after surgery	Observation	395.65 ± 38.78	-6.949	< 0.001	22.45 ± 4.12	-6.671	< 0.001
	Control	445.89 ± 40.56			27.89 ± 4.78
48 hours after surgery	Observation	320.45 ± 35.34	-5.198	< 0.001	18.45 ± 3.67	-4.653	< 0.001
	Control	355.67 ± 38.78			21.67 ± 3.89

P < 0.05 indicated significant difference. Cor: Cortisol; AD: Adrenaline.