Julián Almárcegui Cristina, Huybrechts Inge, Gómez Bruton Alejandro, Matute Llorente Ángel, González Agüero Alejandro, Gómez Cabello Alba, Moreno Luis A, Casajús Jose A, Vicente Rodríguez Germán
GENUD "Growth, Exercise, NUtrition, and Development", University of Zaragoza (Zaragoza), Spain. Faculty of Health and Sport Science (FCSD), Department of Physiatry and Nursing, University of Zaragoza (Huesca), Spain..
Dietary Exposure Assessment Group, International Agency for Research on Cancer, Lyon, France. Faculty of Medicine and Health Sciences, Department of Public Health, Ghent, Belgium..
Nutr Hosp. 2015 Oct 1;32(4):1773-9. doi: 10.3305/nh.2015.32.4.9490.
accurate estimates of the intake of specific nutrients such as calcium (Ca) are crucial to correctly rank or classify subjects in the distribution of intakes. Therefore, we aimed to estimate the relative validity of a food frequency questionnaire (FFQ) for measuring Ca intake in two different groups of healthy adolescents, a normoactive control group and a physically active group of swimmers with 2 non-consecutive 24h recalls (2 x 24HR) collected as the reference method.
Pearson correlations, agreement between the 24HR and the FFQ at an individual level and questionnaire's ability to assign individuals to the same quartile of intake as the 24HR were calculated.
mean daily Ca intakes were 564.6 mg (SD 232.0) and 895.9 mg (SD 343.1) for the 2 x 24HR and FFQ respectively in controls (P < 0.001); and 731.9 mg (SD 299.8) and 979.8 mg (SD 408.5) for the 2 x 24HR and FFQ respectively in swimmers (P < 0.001). Pearson correlations were 0.52 for controls and 0.47 for swimmers after correcting for intra-variability. Cross-classification analysis indicated that 73.7% of controls and 63.1% of swimmers were classified correctly or in the adjacent category. Also, the 89% of the control group and 79% of swimmers were classified correctly with the FFQ according to the dietary reference intake (DRI) of 1300 mg/d.
for both groups, the FFQ tended to overestimate Ca intake, however it demonstrated fairly good ability to classify subjects into extremes of Ca intake and identified adolescents having Ca intakes lower than the dietary reference intake.
准确估计特定营养素（如钙）的摄入量对于在摄入量分布中正确对受试者进行排名或分类至关重要。因此，我们旨在评估食物频率问卷（FFQ）在测量两组不同健康青少年钙摄入量方面的相对有效性，一组是正常活动对照组，另一组是身体活跃的游泳运动员组，以连续两天的24小时膳食回顾（2×24HR）作为参考方法。
计算Pearson相关性、个体水平上24HR与FFQ之间的一致性，以及问卷将个体分配到与24HR相同摄入量四分位数的能力。
对照组中，2×24HR和FFQ的每日平均钙摄入量分别为564.6毫克（标准差232.0）和895.9毫克（标准差343.1）（P<0.001）；游泳运动员组中，2×24HR和FFQ的每日平均钙摄入量分别为731.9毫克（标准差299.8）和979.8毫克（标准差408.5）（P<0.001）。校正个体内变异性后，对照组的Pearson相关性为0.52，游泳运动员组为0.47。交叉分类分析表明，73.7%的对照组和63.1%的游泳运动员被正确分类或分到相邻类别。此外，根据1300毫克/天的膳食参考摄入量（DRI），FFQ将89%的对照组和79%的游泳运动员正确分类。
对于两组而言，FFQ往往高估了钙摄入量，然而它在将受试者分类到钙摄入量极端情况方面表现出相当好的能力，并能识别出钙摄入量低于膳食参考摄入量的青少年。
