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Table 1 Sociodemographic and clinical characteristics of the two samples

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

  Sample 1, n = 276 Sample 2, n = 95
Mean of age (range) 66.8 (21 to 95) 71.9 (52 to 86)
Female (%) 141 (51.0) 71 (74.7)
Visual acuity (Snellen fraction)   
   Better eye, mean (range) 20/120 (20/13 to 20/2000) 20/110 (20/16 to 20/2000)
   Worse eye, mean (range) 20/200 (20/13 to 20/2000) 20/200 (20/20 to 20/2000)
Chronic eye disease, number (%)   
   Age-related cataract 96 (34.8) 95 (100)
   Glaucoma 69 (25.0) Not applicable
   Age-related macular degeneration 80 (29.0) Not applicable
   Normal reference 31 (11.2) Not applicable
Medical comorbidities*   
   0 104 (37.7) Not applicable
   1 97 (35.1) Not applicable
   2 or more 75 (27.2) Not applicable