Contrasting mediating variables in two 5-a-day nutrition intervention programs
Contrasting mediating variables in two 5-a-day nutrition intervention programs
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DOI：
10.1016/j.ypmed.2004.03.022
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发表时间：
2004-11-01
影响因子：
5.1
通讯作者：
Perry, CL
中科院分区：
文献类型：
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作者：
Reynolds, KD;Bishop, DB;Perry, CL
背景。研究人员主张对行为干预研究进行中介分析，将干预中使用的支持理论与中介变量及其最终的成功或失败联系起来。很少有关于学校营养研究的中介分析报告。在多位点研究中进行中介分析，可以为方法的标准化、研究结果的可重复性和可推广性提供优势。本研究确定了两种以学校为基础的四年级营养干预的中介因素。对三个变量进行了四项必要标准的检验，以确定干预对四年级学生果蔬消费（FVC）变化的中介效应（阿拉巴马州，N = 1584；明尼苏达州，N = 522）。采用24小时饮食回顾法测量儿童FVC。使用由儿童和家长填写的问卷对调解员进行评估。在阿拉巴马州，所有的标准都得到了满足，这是一项对每天5份日常饮食指南知识的单项测量。知识和父母消费满足明尼苏达州的一个标准。知识占阿拉巴马州总干预效果的9.78%。了解每天5份水果和蔬菜摄入量的指南可能会调节干预效果。未来的工作应包括在多地点研究中检验中介模型。(C) 2004癌症预防研究所和爱思唯尔公司。版权所有。
Background. Researchers have advocated mediational analysis for behavioral intervention studies to link the supporting theory used in an intervention with the mediating variables and with its ultimate success or failure. Few mediational analyses have been reported for school-based nutrition studies. The conduct of mediational analyses within multi-site studies may provide advantages for the standardization of methods and for the replication and generalizability of findings.Methods. This study identified mediators of two school-based nutrition interventions for 4th graders. Three variables were tested on the four criteria necessary to establish mediation of intervention effects on changes in fruit and vegetable consumption (FVC) in 4th graders (Alabama, N = 1584; Minnesota, N = 522). FVC was measured in children using 24-h dietary recalls. Mediators were assessed using questionnaires completed by children and parents.Results. All criteria were met in Alabama for a single-item measure of knowledge of the 5-a-day daily consumption guideline. Knowledge and parent consumption satisfied one criterion in Minnesota. Knowledge accounted for 9.78% of the total intervention effect in Alabama.Conclusions. Knowledge of the 5-a-day guideline for fruit and vegetable consumption may mediate intervention effects. Future work should include tests of mediational models in multi-site studies. (C) 2004 The Institute For Cancer Prevention and Elsevier Inc. All rights reserved.