Table 1 Demographic and clinical characteristics of the participants

Age (years, mean ± SD)

77.4 ± 7.4

76.8 ± 7.4

0.634^a

Sex (women, %)

69.3

79.5

0.191^a

Education (years, mean ± SD)

9.9 ± 5.6

8.1 ± 5.5

0.065^a

Presence of cohabitants, (present, %)

80.5

74.4

0.371^a

Duration of AD (months, mean ± SD)

36.9 ± 25.7

44.0 ± 37.8

0.265^a

Drugs influencing sleep or motor activity (users, %)

29.2

38.5

0.240^a

History of head injury (present, %)

9.0

10.3

0.792^a

Alcohol drinking (SU/week, mean ± SD)

1.8 ± 7.1

0.7 ± 3.4

0.375^a

Smoking (packs/day, mean ± SD)

0.1 ± 0.6

0.0 ± 0.2

0.750^a

GDS (points, mean ± SD)

12.2 ± 6.9

16.5 ± 6.7

< 0.001^a

CDR (points, mean ± SD)

0.7 ± 0.4

0.9 ± 0.5

0.903^a

STOP-BANG (points, mean ± SD)

2.3 ± 0.9

2.6 ± 1.0

0.041^a

 Total score

1.4 ± 1.2

6.1 ± 1.4

< 0.001^a

 Item-6 score

0.2 ± 0.5

1.2 ± 1.2

< 0.001^a

Intracranial volume (cm³, mean ± SD)

1515.5 ± 147.7

1509.1 ± 154.1

0.805^a

VPP (mm³, mean ± SD)

69.5 ± 18.5

51.7 ± 10.8

< 0.001^b

Cerebral amyloid deposition (present, %)

31.9

28.2

0.643^a