Girls perform somewhat less well in mathematics than boys, yet the gap between female and male school performance is smaller in mathematics than in reading. Findings from the Programme for International Student Assessment (PISA) in relation to science have shown little or no difference in average science performance between girls and boys, with girls outperforming boys in 12 countries and boys scoring marginally higher than girls in 8 countries (OECD, 2009). Data on healthy life years refer to 2010 for Ireland and Norway.