Impact of thoracic paravertebral block and sufentanil on outcomes and postoperative cognitive dysfunction in thoracoscopic lung cancer surgery

Table 2 Changes in Mini-Mental State Examination scores

Grouping	Before surgery	3 days after surgery	5 days after surgery
TPVB group (n = 57)	28.51 ± 0.95	25.05 ± 1.20a	27.56 ± 0.95b
Control group (n = 50)	28.06 ± 1.27	23.42 ± 1.31a	27.38 ± 0.85a,b
t value	2.140	7.909	3.402
P value	0.499	< 0.001	0.016

^aP < 0.05 compared with the preoperative level.

^bP < 0.05 compared with the value at 3 days after surgery.

TPVB: Thoracic paravertebral block.