西安市50岁以上居民食物频率问卷准确性及重现性研究

目的对用于评价西安城区居民膳食营养状况的西安食物频率问卷(FFQ)的重现性和准确性进行食物组的研究。方法在西安城区随机抽取出125名50～80岁当地居民,共完成6轮的食物摄入情况的调查,其中4轮24小时膳食回顾调查(24HDRs)的结果作为参考,通过第一轮FFQ结果与第二轮FFQ以及4轮24HDRs结果之间的比较分别进行FFQ的重现性和准确性研究。结果各个食物组在两轮FFQ间的Spearman相关系数在0.38(糕点类)～0.74(茶类)。第二轮FFQ与4轮24HDRs均值间的相关系数在0.12～0.74之间,经过个体内方差校正后,相关系数均有所提高。结论西安食物频率问卷可以相对准确、可靠地评价西安城区50岁以上居民的膳食营养状况。

Study of validity and reproducibility of food frequency questionnaires for residents over 50 years old in Xi'an City

Objective To examine the validity and reproducibility of Xi'an food-frequencyquestionnaire (FFQ) used to evaluate the diet intakes for residents in Xi'an City. Methods 125 males and females aged 50-80 years, from districts of urban Xi'an City, participated and completed all the six interviews in this study. Reproducibility of the questionnaire measurements was obtained by a repeated administration of the FFQ at one year interval. The mean of 24-hour dietary recalls (24-HDR) applied at three months intervals served as reference method for the estimation of the relative validity of questionnaire measurements. Results Spearman correlation coefficients for reproducibility between two FFQs ranged from 0.38 for cakes to 0.74 for tea. Coefficients for validity assessed by four 24-HDRs were statistically significant for almost all food groups ranged from 0.12 to 0.74. After correction for within-subjects error, all correlation coefficients were improved ranged from 0.17 to 0.79. Conclusion Therefore, Xi'an FFQ appears to be reasonably valid and reliable for most food groups.