On average across OECD countries, parents of socio-economically advantaged students are highly educated: a large majority has attained tertiary education (97%) and works in a skilled, white-collar occupation (94%). By contrast, the parents of socio-economically disadvantaged students have much lower educational attainment. Across OECD countries, 55% of parents of disadvantaged students attained some post-secondary non-tertiary education as their highest level of formal schooling, 33% attained lower secondary education or less, and only 12% attained tertiary education. Few disadvantaged students have a parent working in a skilled occupation (8%); many parents of these students work in semi-skilled, white-collar occupations (43%), and the majority (49%) work in elementary occupations or semi-skilled, blue-collar occupations (Table ll.6.2b).