Table 1.

Results of the Exploratory and Confirmatory Factor Analyses and Item Convergent and Discriminant Validity (n=1965)

Items	Item description	Exploratory Factor Analysis*		Confirmatory Factor Analysis†	Item-scale correlations‡	Correlations with other scales‖
		Factor loading	Communality	Factor loading	r	Range of r
Item 1	Ability to use telephone	0.67	0.45	0.84	0.61	0.14 – 0.58
Item 2	Ability to do shopping	0.87	0.75	0.94	0.84	0.16 – 0.69
Item 3	Food preparation capacity	0.89	0.79	0.96	0.82	0.15 – 0.65
Item 4	Housekeeping ability	0.90	0.81	0.95	0.87	0.18 – 0.66
Item 5	Capacity to do laundry	0.87	0.75	0.95	0.82	0.12 – 0.63
Item 6	Independence for transportation	0.77	0.59	0.84	0.75	0.21 – 0.65
Item 7	Ability to manage self-medication	0.75	0.57	0.89	0.69	0.15 – 0.64
Item 8	Ability to handle finances	0.80	0.64	0.90	0.70	0.12 – 0.63

r: Spearman correlation coefficient.

^* The first factor explained the 70.64% of the total variability.

^† Fit indexes: χ² = 282.07; degrees of freedom = 20; RMSEA (90% CI) = 0.08 (0.07 – 0.09); TLI = 0.992; CFI = 0.994.

^‡ Item total correlation with its own Lawton IADL Scale corrected for overlap.

^‖ Correlation between Lawton IADL Scale and Barthel Index, SF-12 PCS, WOMAC short form and QuickDASH domains.