Objectives This study was design to develop a semi-quantitative Chinese Food Frequency Questionnaire (FFQ) and to conduct a validation study for the questionnaire. Methods Based on the survey experience in recent years, a new Chinese food frequency questionnaire (FFQ) with 149 items in 17 food categories was developed. A validation study on this new FFQ was conducted in Jiangsu and Beijing of China between 1999 and 2001. The period of study covered 1 year and the FFQ was validated by comparing with data obtained by a six repeated 24-hour recalls for 3 consecutive days, or a totally 18-day 24- hour recall throughout the year. A total of 271 healthy adult subjects were enrolled in the study. Food and nutrient intakes measured by the 18-day dietary recalls and food frequency questionnaires (FFQs) were computed in the National Institute for Nutrition and Food Safety, China CDC using the existing nutrition database. The average daily intake of foods and nutrients over the 18-day recall was used to compare with FFQ1 and FFQ2, which was conducted at the beginning and the end of the year, respectively. All statistical analyses were carried out using SAS software version 6.12.
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机译：A Sanskrit-Chinese Collation Study of the Larger Sukhāvatīvyūha Sūtra Grammar under the Framework of Chinese Historical Linguistics—A Case of the Chinese Translations of Sanskrit Instrumental, Ablative and Locative Nouns =汉语历史语言学框架中的《无量寿经》语法梵汉对勘研究——以梵语名词工
机译：避孕普及率调查：模型调查问卷（Encuesta de prevalencia del Uso de anticonceptivos：Cuestionario modelo）（Etude de predominance des methodes Contraceptives：Questionnaire modele）
