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

Table 8 Scalability and internal consistency from six QUALIDEM subscales for people with very severe dementia (n = 182), 11% of all items have missing values (350 out of 3276 data points from items are missing)

Item Nr.	Subscale (Item)	Qualidem David			Dichter et al. [30] (Total)			Arons et al. [31] (2017)
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	0.50	0.74	0.70	0.47	0.73	0.67	0.43	0.79
7	Is angry	0.55			0.54			0.53
14	Has conflicts with nursing assistants	0.58			0.54			0.56
31	Accepts help	0.36			0.35			0.41
B	Positive affect	0.71	0.91	0.90	0.65	0.86	0.85	0.65	0.90
5	Radiates satisfaction	0.72			0.70			0.66
8	Is capable of enjoying things in daily life	0.71			0.64			0.64
21	Has a smile around the mouth	0.75			0.65			0.68
40	Mood can be influenced in positive sense	0.67			0.59			0.61
C	Negative affect	0.65	0.69	0.62	0.36	0.50	0.47	0.61	0.77
6	Makes an anxious impression	0.64			0.36			0.51
23	Cries	0.64			0.36			0.65
D	Restless tense behavior	0.65	0.83	0.80	0.37	0.59	0.62	0.38	0.63
2	Makes restless movements	0.60			0.47			0.48
19	Is restless	0.61			0.45			0.43
22	Has tense body language	0.72			0.18			0.24
F	Social relations	0.34	0.55	0.53	0.33	0.53	0.52	0.34	0.60
3	Has contact with other patients	0.27			0.36			0.38
12	Responds positively when approached	0.42			0.34			0.43
25	Cuts himself/herself off from environment	0.32			0.30			0.21
G	Social isolation	0.45	0.65	0.66	0.20	0.42	0.41	0.41	0.66
16	Is rejected by other patients	0.39			0.25			0.46
20	Openly rejects contact with others	0.56			0.21			0.39
32	Calls out	0.42			0.13			0.37

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