Intervention-related bias in reporting of food intake by fifth-grade children participating in an obesity prevention study
Intervention-related bias in reporting of food intake by fifth-grade children participating in an obesity prevention study
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DOI：
10.1093/aje/kwh328
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发表时间：
2004-12-01
影响因子：
5
通讯作者：
Weber, JL
中科院分区：
文献类型：
--
作者：
Harnack, L;Himes, JH;Weber, JL
作为Pathways的一部分收集的数据，Pathways是1997年至2000年在美国印第安儿童中进行的一项以学校为基础的肥胖一级预防试验，分析了食物报告中可能的干预相关偏倚。作者假设，干预学校的儿童可能系统地报告了他们相对于对照学校儿童的饮食摄入量。将记录辅助的24小时膳食回忆得出的午餐营养素摄入量估计值与观察到的午餐摄入量估计值进行比较。报告的营养素摄入量作为因变量纳入回归分析;观察到的摄入量，干预条件和年龄作为自变量。结果表明，在女性中，干预条件是一个显着的预测报告的能量，脂肪和饱和脂肪酸的摄入量。独立观察到的摄入量，在干预学校的女性午餐能量摄入量为66.8卡路里，低于控制学校的女性（p = 0.03）。这些发现表明，研究者在进行以饮食为重点的干预研究时，应考虑干预条件下报告饮食摄入量的偏倚。具体而言，加强措施，依赖于自我报告的饮食摄入量的客观措施，将有助于研究人员评估是否发生治疗组的差异报告。
Data collected as part of Pathways, a school-based trial for the primary prevention of obesity in American Indian children conducted between 1997 and 2000, were analyzed to examine possible intervention-related bias in food reporting. The authors hypothesized that children in the intervention schools may have systematically underreported their dietary intake relative to children in the control schools. Nutrient intake estimates for lunch derived from record-assisted 24-hour dietary recalls were compared with intake estimates from observed lunch intakes. Reported nutrient intakes were included in regression analyses as the dependent variables; observed intake, intervention condition, and age were included as independent variables. Results indicated that, among females, intervention condition was a significant predictor of reported energy, fat, and saturated fatty acid intakes. Independently of observed intake, reported lunch energy intake among females in the intervention schools was 66.8 calories lower than reported intake among females in the control schools (p = 0.03). These findings suggest that investigators should consider bias in reporting of dietary intake by intervention condition when conducting diet-focused intervention studies. Specifically, enhancing measures that rely on self-reports with objective measures of dietary intake would help investigators to evaluate whether differential reporting by treatment group has occurred.