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Table 1 Results of the Exploratory and Confirmatory Factor Analyses and Item Convergent and Discriminant Validity (n=1965)

From: Validation of the Spanish version of the Lawton IADL Scale for its application in elderly people

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
  1. r: Spearman correlation coefficient.
  2. * The first factor explained the 70.64% of the total variability.
  3. Fit indexes: χ2 = 282.07; degrees of freedom = 20; RMSEA (90% CI) = 0.08 (0.07 – 0.09); TLI = 0.992; CFI = 0.994.
  4. Item total correlation with its own Lawton IADL Scale corrected for overlap.
  5. Correlation between Lawton IADL Scale and Barthel Index, SF-12 PCS, WOMAC short form and QuickDASH domains.