From: Predicting participation of people with impaired vision in epidemiological studies
AGE | AGE1 = age less than 40 years AGE2 = age between 40 and 69 years AGE3 = age 70 or more years |
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AHATTEND | AHA-rare = number of annual hospital appointments less than 10 AHA-frequent = number of annual hospital appointments 10 or more |
EDU | EDU1 = less than 12 years of education EDU2 = 12 or more years of education |
DISTH | DISTH1 = if distance residence-hospital was less than 40 Km DISTH2 = if distance residence-hospital was 40 Km or more |
VA | VA-extreme; includes VA of 0.0 or 0.1 or 0.5 VA-intermediate; includes VA of 0.2 or 0.3 or 0.4 |
MST | 1 = Married; 2 = Together; 3 = Single; 4 = Widow; 5 = Divorced |
GENDER | 1 = Male; 2 = Female |