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Table 4 Categories used to analyse differences between immediate (Ipar) and late participants (Lpar) and between late and non-participants (Npar)

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
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