PEDUC ISCED97 LIS recode 0 pre-primary-lower secondary education/no education/unknown 1 30 upper secondary 2 40 post-secondary non-tertiary education 2 51 first stage of tertiary education 5B 3 52 first stage of tertiary education 5A 3 53 first stage of tertiary education 5A 3 60 second stage of tertiary education 3