 ይህ ልዩነት በአንዳንድ ባህልና ልማድ ላይ የተመሰረተ ብቻ ሳይሆን በአስተምህሮ ላይ ጭምር የተንጸባረቀ መሆኑ ጉዳዩን አሳሳቢ ያደርገዋል።
It's been suggested that this difference in achievement may be due not only to a culture of study and vocational training, but partially to a difference in population history.