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

Table 2 Comparison of postoperative Montreal Cognitive Assessment scores among different groups, n = 30 for each group

Time point	Youth control group	Youth observation group	Elderly control group	Elderly observation group	t	P value
1 day before surgery	27.80 ± 1.08	27.75 ± 1.12	27.40 ± 1.22	27.25 ± 1.06	0.521	0.611
1 day post-surgery	25.20 ± 1.54	23.10 ± 1.60	24.20 ± 1.49	22.00 ± 1.69	3.437	0.002
3 days post-surgery	25.40 ± 1.43	23.80 ± 1.58	24.80 ± 1.40	23.10 ± 1.60	2.983	0.007
7 days post-surgery	26.20 ± 1.30	24.60 ± 1.45	25.80 ± 1.38	24.40 ± 1.56	3.205	0.003

P < 0.05 indicated significant difference.