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Table 3 Internal consistency and test-retest reliability of NEI VFQ-25 subscales

From: Psychometric properties of the 25-item National Eye Institute Visual Function Questionnaire (NEI VFQ-25), Japanese version

  Number of items Cronbach's alpha Intraclass correlation, for test-retest reliability Range of item-scale correlations Convergent validity* Discriminant validity**
General health 1 NA*** 0.51 NA NA NA
General vision 1 NA 0.48 NA NA NA
Near vision**** 3 0.87 (0.85) 0.76 (0.69) 0.65 – 0.75 (0.69 – 0.73) 100 (100) 93.9 (100)
Distance vision**** 3 0.84 (0.79) 0.85 (0.69) 0.67 – 0.75 (0.57 – 0.69) 100 (100) 90.9 (100)
Driving 2 0.58 0.99 0.49 – 0.49 100 50.0
Peripheral vision 1 NA 0.62 NA NA NA
Color vision 1 NA 0.74 NA NA NA
Ocular pain 2 0.44 0.75 0.28 – 0.28 0 81.8
Vision-specific       
   Role limitation 2 0.82 0.88 0.70 – 0.70 100 90.9
   Dependency 3 0.87 0.90 0.71 – 0.82 100 97.0
   Social function 2 0.74 0.88 0.58 – 0.58 100 59.1
   Mental health 4 0.84 0.94 0.62 – 0.75 100 90.9
25-item composite 25 0.96 0.94 NA NA NA
  1. * The percentage of items that passed the test of convergent validity (as described in the text).
  2. ** The percentage of items that passed the test of discriminant validity (as described in the text).
  3. *** NA: Not applicable to single-item scales
  4. **** Scores were recomputed after the substitution of items described in the text. Results of the recomputations are in parentheses.