You can also see that there is a gap of almost three and a half school years between 15-year-olds in Shanghai and 15-year-olds in Chile, and the gap grows to seven school years when you include the countries with really poor performance.
Također, možete vidjeti da postoji razlika od gotovo tri i pol školske godine između petnaestogodišnjaka u Šangaju i u Čileu, a razlika raste do čak sedam školskih godina kada uključite zemlje sa zbilja slabim rezultatima.