Table 3.

Grading of cognitive impairment after treatment in the two groups (n, %)

Group	Cognitive impairment (n)				Favorable rate	χ2	P
	No symptom	Mild	Moderate	Severe
Observation group (n=83)	10	41	29	3	80/83 (96.40%)	4.691	0.030
Control group (n=83)	8	32	31	12	71/83 (85.54%)