But what does it mean? The use of effect sizes in educational research

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Exploring social patterns of participation in university-entrance level mathematics in England (2009, unknown): “…compared to 0.7 for Indian girls) are striking but the proportions of some of these ethnic groups out of the whole population is relatively small, so the overall effect size (Schagen and Elliot 2004) across this cohort and the whole population is relatively much smaller than the gender effect.”
Science-related Aspirations Across the Primary–Secondary Divide: Evidence from two surveys in England (2014, background): “In educational research effect sizes above 0.5 are typically considered large, between 0.3 and 0.5, medium and 0.1 to 0.2, small (Schagen & Elliot, 2004).”