使用经验证有效的食物频率问卷收集饮食摄入资料。
Information on dietary intake was collected using a validated food frequency questionnaire.
以葡萄糖作为参考值，利用有效的食物频率问卷来估计GI和GL。
A validated food-frequency questionnaire was used to estimate GI and gl, with glucose as the reference value.
镁的摄入情况是通过每4年向参加者发放半定量的食物频率问卷表来调查的。
Magnesium consumption was determined with a semiquantitative food frequency questionnaire sent to the subjects every 4 years.
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