Table 2.

Item Content, Difficulty Parameter, SE, and Fit Statistics

Item content	Difficulty	SE difficulty parameter	INFIT MNSQ	OUTFIT MNSQ
Bend	1.55	0.02	0.98	0.97
Walk	1.32	0.02	0.82	0.76
Shopping	0.9	0.02	0.9	0.83
Carrying	0.89	0.02	0.78	0.66
Stairs	0.89	0.02	0.83	0.65
Gripping	0.75	0.03	1.11	1.2
Meal prep	0.69	0.02	1.02	0.98
Laundry	0.68	0.02	1.08	1.12
Banking	0.39	0.02	1.07	1.15
Reaching	0.29	0.02	1.03	0.96
Medication	−0.1	0.02	1.11	1.25
Bathing	−0.25	0.02	1.05	0.88
Dressing	−0.35	0.02	1.31	1.34
Outdoor mobility	−0.47	0.02	0.98	0.86
Bed mobility	−1.39	0.03	0.91	0.85
Indoor mobility	−1.66	0.02	1.13	0.97
Toileting	−1.89	0.03	0.84	0.66
Eating/feeding	−2.24	0.03	1.17	1.31