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Table 1 Summary of the distribution of 600 subjects included in the analysis. Among 600, 325 are participants a (immediate or late) and 275 non-participants randomly selected from 1577 total non-participants

From: Predicting participation of people with impaired vision in epidemiological studies

Characteristic n (%) Participation YES/NO Participation (%) p-value (χ2)
Gender     < 0.001
 Male 339 (56.6) 225/114 66.4  
 Female 261 (43.4) 100/161 38.3  
Age group     0.00535
  < 20 yrs 14 (2.3) 12/2 85.7  
 20 to < 30 yrs 8 (1.3) 6/2 75.0  
 30 to < 40 yrs 28 (4.7) 27/1 96.4  
 40 to < 50 yrs 43 (7.2) 34/9 79.1  
 50 to < 60 yrs 82 (13.7) 52/30 63.4  
 60 to < 70 yrs 137 (22.8) 80/57 58.4  
 ≥ 70 yrs 288 (48.0) 114/174 39.6  
Number of Hospital Appointments per year (AHATTEND)     < 0.001
 Low - AHA (≤4×/yr) 173 (28.8) 52/121 30.1  
 Medium - AHA (5 to 9×/yr) 178 (29.7) 86/92 48.3  
 High – AHA (≥ 10×/yr) 249 (41.5) 187/62 75.1  
Marital Status (MST)     < 0.001
 Married 261 (43.5) 110/151 42.1  
 Living together 85 (14.2) 76/9 89.4  
 Single 82 (13.7) 56/26 68.3  
 Widow 131 (21.8) 48/83 36.6  
 Divorced 41 (6.8) 35/6 85.4  
Visual Acuity- decimal scale (VA)     < 0.001
 0 42 (7.0) 26/16 61.9  
 0.1 80 (13.3) 51/29 63.8  
 0.2 105 (17.5) 43/62 40.9  
 0.3 87 (14.5) 35/52 40.2  
 0.4 129 (21.5) 63/66 48.8  
 0.5 157 (26.2) 107/50 68.1  
Aetiology of visual impairment (CAUSE-VI)     0.4336
 Adult Macular Degeneration 76 (16.0) 31/45 40.8  
 Diabetic retinopathy 191 (40.1) 110/81 57.6  
 Glaucoma 60 (12.6) 26/34 43.3  
 Other 149 (31.3) 81/68 54.4  
 Multiple or undefined 124    
  1. aParticipants as mentioned here include immediate and late participants