The samples were collected during an annual, nationwide survey conducted by the CDC, known as the National Health and Nutrition Examination Survey.

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The new analysis, which appears in the June issue of the journal Pediatrics, included a nationally representative sample of 3, 383 adolescents who participated in the National Health and Nutrition Examination Survey, a biannual survey conducted by the CDC.

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The new statistic derives from China's first comprehensive national survey on diet, nutrition and diseases, which was conducted by the Ministry of Health.

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