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

Table 6 Known-group validity for the QUALIDEM score for five distinct groups, by patients with mild to severe dementia (n = 344) and patients with very severe dementia (n = 182)

Hypothesis	Mild to severe dementia
Hypothesis	Cohen’s d	p*	Decision	Cohen’s d	p*	Decision
No significant difference in QoL between younger and older elderly patients	0.11	0.319^a	Accept	0.15	0.346^a	Accept
No significant difference in QoL between female and male patients	0.10	0.403^a	accept	0.14	0.388^a	Accept
QoL is significantly lower for patients with higher functional limitations	0.51	< 0.001^b	Accept	0.90	< 0.001^b	Accept
QoL is significantly lower for patients with higher agitation and challenging behavior	1.17	< 0.001^b	Accept	1.35	< 0.001^b	Accept
QoL is significantly lower for patients with a higher number of comorbidities	0.21	0.029^b	Accept	0.22	0.072^b	Reject

^*p values for t-test, indicating statistically significant differences of QUALIDEM scores between distinct groups
^aTWO-sided t-test
^bONE-sided t-test

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