One thing overlooked is the fact that China has a vastly higher number of people. The United States has a higher percentage of people who achieve "higher" education as tested, at least in comparison to China. If the percentage of people that went to Chinese universities was compared to the same percentage of people going to American or UK universities you might just find schools like MIT or Oxford in the comparison. Point being, statistically the study isn't taking into account overall effects of the system on the country in question.
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One thing overlooked is the fact that China has a vastly higher number of people. The United States has a higher percentage of people who achieve "higher" education as tested, at least in comparison to China. If the percentage of people that went to Chinese universities was compared to the same percentage of people going to American or UK universities you might just find schools like MIT or Oxford in the comparison. Point being, statistically the study isn't taking into account overall effects of the system on the country in question.