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Table 2 Summary of the distribution of all cases (n = 600) according to participation

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

Characteristic Participants (n = 325) Non-participants (n = 275) n (%) p-value (χ2)
Immediate (n = 241) n (%) Late (n = 84) n (%)
Gender     < 0.001
 Male 183 (75.9) 42 (50) 114 (41.4)  
 Female 58 (24.1) 42 (50) 161 (58.6)  
Age group     0.00535
  < 20 yrs 10 (4.1) 2 (2.4) 2 (0.7)  
 20 to < 30 yrs 2 (0.8) 4 (4.8) 2 (0.7)  
 30 to < 40 yrs 14 (5.8) 13 (15.5) 1 (0.4)  
 40 to < 50 yrs 27 (11.2) 7 (8.3) 9 (3.3)  
 50 to < 60 yrs 43 (17.8) 9 (10.7) 30 (10.9)  
 60 to < 70 yrs 64 (26.6) 16 (19) 57 (20.7)  
 ≥ 70 yrs 81 (33.7) 33 (39.3) 174 (63.3)  
Number of Hospital Appointments per year     < 0.001
 Low - AHA (≤4×/yr) 42 (17.4) 10 (11.9) 121 (44)  
 Medium - AHA (5 to 9×/yr) 70 (29) 16 (19) 92 (33.5)  
 High – AHA (≥ 10×/yr) 129 (53.6) 58 (69) 62 (22.5)  
Marital Status     < 0.001
 Married 75 (31.1) 35 (41.7) 151 (54.9)  
 Living together 76 (31.5) 0 (0) 9 (3.3)  
 Single 35 (14.5) 21 (25) 26 (9.5)  
 Widow 25 (10.4) 23 (27.3) 83 (30.2)  
 Divorced 30 (12.4) 5 (6) 6 (2.1)  
Visual Acuity (decimal scale)     < 0.001
 0 18 (7.5) 8 (9.5) 16 (5.8)  
 0.1 28 (11.6) 23 (27.4) 29 (10.5)  
 0.2 33 (13.7) 10 (11.9) 62 (22.5)  
 0.3 31 (12.9) 4 (4.8) 52 (18.9)  
 0.4 47 (19.5) 16 (19) 66 (24)  
 0.5 84 (34.8) 23 (27.4) 50 (18.3)  
Aetiology of visual impairment(*)     0.4336
 Age-related Macular Degeneration 18 (7.5) 13 (15.5) 45 (16.4)  
 Diabetic retinopathy 87 (36.1) 23 (27.4) 81 (29.5)  
 Glaucoma 17 (7.1) 9 (10.7) 34 (12.4)  
 Other 58 (24.1) 23 (27.4) 68 (24.7)  
 Multiple or undefined 124