Table 2.

Comparison of MMSE scale scores between the two groups of patients (x̅ ± s, score).

Groups	Patients	Preoperative	1 d after surgery
Control group	27	28.26 ± 2.95	23.16 ± 2.25*
Study group	27	28.18 ± 2.87	25.49 ± 2.34*
t-value		0.101	3.730
p-value		0.920	<0.001

Note: MMSE, Mini Mental State Examination; Comparedwiththe same group of patients before operation, *p < 0.05.