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Among the top three contributors, 12. 13 mg of caffeine was derived from tea, milk tea and tea beverages(including solid drinks), with a contribution rate which reached 56. 01%, 4. 35 mg of caffeine was derived from coffee, with a contribution rate of 20. 09%, and 3. 31 mg of caffeine was derived from cola and energy drinks, with a contribution rate of 15. 30%, and there existed slightly difference of the top three contribution foods among 6-11 and 12-17 years old children and adolescents. CONCLUSION Children and adolescents aged 6-17 y