男性食物频率问卷中食物组摄入量重现性和有效性的影响因素分析

Evaluation of reproducibility and validity of food group intakes measured by a food frequency questionnaire for Chinese men

目的评估和分析一份男性食物频率问卷(food frequency questionnaire,FFQ)中食物组摄入量的重现性和有效性的影响因素。方法从一项大规模人群队列研究"上海市男性健康队列"中随机选取了214名对象,在进入队列时均完成了第1次FFQ调查,其后开始进行每月1次、为期1年的24 h膳食回顾调查(24-hour dietary recall,24-HDR),在12次24-HDR调查完成后再重新进行与第1次FFQ相同的第2次FFQ调查,2次FFQ的平均间隔时间为1.2年。将FFQ及24-HDR调查所得的食物项归类为11个食物组,通过2次FFQ的食物组摄入量的Pearson相关系数,来评估和分析FFQ测量食物组摄入量的重现性的影响因素。有效性的影响因素则通过比较第2次FFQ与24-HDR的食物组摄入量的Pearson相关系数来评估。结果共有195名研究对象完成了全部的2次FFQ与12次24-HDR调查。2次FFQ之间各食物组摄入量的Pearson相关系数的中位数在高、低年龄组分别为0.62、0.50;高、低教育水平组分别为0.58、0.50;高、低收入组分别为0.51、0.50;高、低BMI组分别为0.50、0.49。第2次FFQ与24-HDR的各食物组摄入量的Pearson相关系数的中位数在高、低年龄组分别为0.61、0.45;高、低教育水平组分别为0.49、0.47;高、低收入组分别为0.43、0.57;高、低BMI组分别为0.48、0.51。结论上海市男性健康队列所采用的食物频率问卷中食物组摄入量的重现性的影响因素主要是研究对象的年龄,有效性的影响因素主要是年龄和收入水平。

Objective To evaluate the factors influencing the reproducibility and validity of food group intakes measured by a food frequency questionnaire（FFQ） for Chinese men. Methods A total of 214 adult men were randomly selected from the Shanghai Men Health Study（SMHS）,an ongoing cohort study conducted in urban Shanghai.Each subject who had completed the first FFQ survey at recruitment took 24-hour dietary recall（24-HDR） surveys which were conducted once a month for 12 consecutive months and a second FFQ at the end of the study.Two FFQs were administered approximately 1.2 years apart.The food items listed in FFQ and obtained from 24-HDR were categorized into 11 food groups.The factors influencing the reproducibility of the FFQ was assessed by comparing the Pearson correlation of intake levels from the two FFQs,while the factors influencing the validity was evaluated by comparing intake levels from the second FFQ with the multiple 24-HDRs. Results A total of 195 men completed all 12 times of 24-HDR and twice FFQ surveys.The median Pearson correlation coefficients of the food groups between the two FFQs in older vs younger age group were 0.62 vs 0.50;in higher vs lower education level group were 0.58 vs 0.50;in higher vs lower income group were 0.51 vs 0.50;in higher vs lower BMI group were 0.50 vs 0.49.The median Pearson correlation coefficients of the food groups between the second FFQ and 24-HDRs in older vs younger age group were 0.61 vs 0.45;in higher vs lower education level group were 0.49 vs 0.47;in higher vs lower income group were 0.43 vs 0.57;in higher vs lower BMI group were 0.48 vs 0.51. Conclusions Age is the main factor influencing the reproducibility of the food group intakes by a FFQ used in the SMHS,while the factors influencing the validity are age and family income.