Feasibility, validity and reliability of the ASCOT-Proxy and ASCOT-Carer among unpaid carers of people living with dementia in England

Table 7 Item statistics including difficulty (in logits), infit and outfit mean square and point-measure correlations for the ASCOT-Carer

Scale domain (item)	Item difficulty	SE	INFIT MNSQ^a	OUTFIT MNSQ^a	Point-measure correlation
Personal safety	-3.23	0.14	1.20	2.27	0.46
Social participation and involvement	0.65	0.10	0.98	0.97	0.75
Control over daily life	0.33	0.11	0.91	0.91	0.75
Occupation	1.02	0.12	0.76	0.77	0.76
Feeling encouraged and supported	0.40	0.10	1.35	1.39	0.64
Space and time to be yourself	0.89	0.11	0.79	0.79	0.79
Self-care	-0.07	0.09	0.92	0.91	0.74
ASCOT-Carer (mean)	0.00	0.11	0.99	1.14

Abbreviations: Infit MNSQ Information-weighted mean square, Outfit MNSQ Outlier-sensitive mean square.
^aValues in the range of .5 to 1.5 indicate a good fit. Items highlighted in bold did not meet this criteria.

ISSN: 1477-7525