on average an almost point difference in literacy proficiency separates adults of highly educated parents from those whose parents have the lowest levels of education on average the likelihood of being a low performer is about percentage points lower for adults with at least one tertiaryeducated parent compared with adults whose parents have an upper secondary education adults whose literacy is rated at level and below predominantly have poorly educated parents on average more than half of adults below the baseline in literacy proficiency had parents who had not completed an uppersecondary education