Near-infrared brain functional characteristics of mild cognitive impairment with sleep disorders

Table 1 Baseline data

Group	MCI group (n = 120)	Control group (n = 50)	t	P value
Sex (male/female)	67/53	30/20	0.250	0.617
Age (years)	65.39 ± 7.16	64.87 ± 8.03	0.416	0.678
Body mass index (kg/m2)	22.66 ± 2.18	22.74 ± 2.34	0.213	0.831
Years of schooling (years)	6.51 ± 2.02	6.39 ± 1.68	0.370	0.712
Duration of MCI (months)	4.38 ± 1.02	4.21 ± 1.13	0.959	0.339
Systolic pressure (mmHg)	138.21 ± 23.68	124.32 ± 10.15	3.992	< 0.001
Diastolic blood pressure (mmHg)	86.20 ± 9.23	79.22 ± 6.69	4.840	< 0.001

MCI: Mild cognitive impairment.

Table 2 Pittsburgh sleep quality index and its scores in each dimension

Group	PSQI	Subjective sleep quality	Sleep time	Total sleep time	Sleep efficiency	Nocturnal sleep disturbance	Daytime dysfunction
MCI group (n = 120)	6 (6, 6)	2 (2, 2)	0 (0, 1)	2 (2, 3)	0 (0, 1)	0 (0, 1)	0 (0, 1)
Control group (n = 50)	9 (8, 10)	1 (1, 1)	2 (2, 2)	1 (1, 1)	2 (1, 2)	2 (1, 2)	2 (1.75, 2)
Z	-10.518	-11.592	-10.368	-9.924	-9.035	-10.661	-10.088
P value	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001

PSQI: Pittsburgh sleep quality index.