Table 1 Descriptive statistics of sample’s demographics and measures of interest, by dementia severity, and results of independent t-tests on the differences between the two groups for each outcome of interest

M

SD

M

SD

t₍₁₁₁₎

p

Narrative Language Test

12.72

4.99

8.91

4.17

4.39

< 0.001

Cornell scale

6.40

6.09

2.85

3.30

3.81

< 0.001

NPI (total score)

13.72

15.47

4.20

5.64

4.30

< 0.001

NPI- delirium

0.14

0.63

0.36

0.82

-1.36

0.10

NPI- hallucinations

0.02

0.13

0.22

0.73

-2.04

0.04

NPI- agitation

2.09

3.24

0.51

1.08

3.43

< 0.001

NPI- dysphoria

1.97

2.75

0.76

1.41

2.89

0.01

NPI- anxiety

2.09

3.32

0.62

1.56

2.97

0.01

NPI- euphoria

0.19

0.94

0.04

0.18

1.18

0.24

NPI- apathy

2.21

3.83

0.58

1.53

2.30

0.01

NPI- disinhibition

0.76

2.03

0.27

1.19

1.53

0.12

NPI- irritability

1.90

2.83

0.64

1.49

2.93

0.01

NPI- motor disturbances

0.57

1.75

0.00

0.00

2.39

0.02

NPI- sleep disturbances

0.79

2.11

0.05

0.40

2.54

0.01

NPI- food issues

1.05

2.46

0.15

0.62

2.65

0.01

QoL-AD

29.59

9.45

25.09

8.68

2.67

0.01

Loneliness (total score)

15.81

5.11

16.82

4.05

-1.15

0.25

Social loneliness

7.36

2.88

8.38

2.54

-1.98

0.04

Emotional loneliness

8.45

3.01

8.44

2.20

0.02

0.98