Table 5. Comparison of serum S100B level between mild cognitive impairment and moderate-severe cognitive impairment group, *P<0.05 represents that the difference was statistically significant.

Index	Mild cognitive impairment (n=34)	Moderate-severe cognitive impairment (n=18)	t	P
S100B(ug/L)	0.132±0.027	0.087±0.015	7.579	0.000*