Item distribution, scalability and internal consistency of the QUALIDEM quality of life assessment for patients with dementia in acute hospital settings

Lüdecke, Daniel; Dichter, Martin Nikolaus; Nickel, Stefan; Kofahl, Christopher

doi:10.1186/s12955-023-02094-1

Table 7 Scalability and internal consistency from nine QUALIDEM subscales for people with mild to severe dementia (n = 344), 5% of all items have missing values (612 out of 12,728 data points from items are missing)

From: Item distribution, scalability and internal consistency of the QUALIDEM quality of life assessment for patients with dementia in acute hospital settings

Item Nr	Subscale (Item)	Qualidem David			Dichter et al. [30] (Total)			Arons et al. [31]
Item Nr	Subscale (Item)	Scale-H (Item H_i)	ρ	Cronbach’s α	Scale-H (Item H_i)	ρ	Cronbach’s α	Scale-H (Item H_i)	ρ
A	Care relationship	0.43	0.82	0.82	0.42	0.81	0.81	0.45	0.80
4	Rejects help from nursing assistants	0.24			0.48			0.47
7	Is angry	0.51			0.49			0.51
14	Has conflicts with nursing assistants	0.51			0.52			0.56
17	Accuses others	0.33			0.32			0.41
24	Appreciates help he or she receives	0.47			0.39			0.30
31	Accepts help	0.42			0.43			0.36
33	Criticizes the daily routine	0.51			0.31			0.44
B	Positive affect	0.77	0.95	0.94	0.65	0.91	0.90	0.65	0.90
1	Is cheerful	0.80			0.67			0.66
5	Radiates satisfaction	0.78			0.69			0.67
8	Is capable of enjoying things in daily life	0.73			0.62			0.64
10	Is in a good mood	0.81			0.71			0.72
21	Has a smile around the mouth	0.78			0.66			0.66
40	Mood can be influenced in positive sense	0.70			0.52			0.54
C	Negative affect	0.31	0.48	0.45	0.53	0.73	0.72	0.62	0.80
6	Makes an anxious impression	0.33			0.49			0.55
11	Is sad	0.26			0.59			0.65
23	Cries	0.33			0.52			0.65
D	Restless tense behavior	0.55	0.76	0.74	0.45	0.69	0.68	0.36	0.61
2	Makes restless movements	0.53			0.51			0.41
19	Is restless	0.53			0.51			0.35
22	Has tense body language	0.58			0.32			0.32
E	Positive self-image	0.17	0.35	0.34	0.42	0.67	0.67	0.64	0.83
27	Indicates he or she would like more help	0.12			0.36			0.64
35	Indicates not being able to do anything	0.17			0.50			0.62
37	Indicates feeling worthless	0.22			0.41			0.66
F	Social relations	0.47	0.79	0.76	0.43	0.77	0.73	0.30	0.65
3	Has contact with other patients	0.47			0.47			0.40
12	Responds positively when approached	0.46			0.44			0.34
18	Takes care of other patients	0.67			0.42			0.24
25	Cuts himself/herself off from environment	0.45			0.33			0.15
29	Is on friendly terms with one or more patients	0.55			0.45			0.37
34	Feels at ease in the company of others	0.28			0.48			0.38
G	Social Isolation	0.32	0.52	0.52	0.28	0.53	0.52	0.44	0.69
16	Is rejected by other patients	0.28			0.35			0.46
20	Openly rejects contact with others	0.36			0.29			0.45
32	Calls out	0.32			0.21			0.39
H	Feeling at home	0.16	0.36	0.29	0.31	0.62	0.61	0.51	0.77
13	Indicates that he or she is bored	0.09			0.26			0.52
28	Indicates feeling locked up	0.11			0.34			0.62
36	Feels at home on the ward	0.12			0.30			0.20
39	Wants to get off the ward	0.28			0.34			0.58
I	Having something to do	0.56	0.69	0.64	0.18	0.23	0.24	0.39	0.53
26	Finds things to do without help from others	0.56			0.18			0.39
38	Enjoys helping with chores on the ward	0.56			0.18			0.39

Item numbers in tables correspond to those in Dichter et al. and Arons et al. to make comparison easier
Bold values refer to the subscale

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