Self efficacy for fruit, vegetable and water intakes: Expanded and abbreviated scales from item response modeling analyses
Self efficacy for fruit, vegetable and water intakes: Expanded and abbreviated scales from item response modeling analyses
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DOI：
10.1186/1479-5868-7-25
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发表时间：
2010-03-29
影响因子：
8.7
通讯作者：
Riz, Anna-Maria Siega
中科院分区：
文献类型：
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作者：
Baranowski, Tom;Watson, Kathleen B.;Riz, Anna-Maria Siega
目的：为了提高现有的措施，水果和蔬菜摄入自我效能，包括项目的难度水平不同，并测试相应的措施，水摄入自我efficacy.Design：横断面评估。项目进行了修改，有容易，中等和困难的自我效能感水平。采用经典测验理论和项目反应模型。地点：七个参与点，每个点一所中学（德克萨斯州休斯顿、加利福尼亚州欧文、宾夕法尼亚州费城、宾夕法尼亚州匹兹堡、俄勒冈州波特兰、北卡罗来纳州农村和德克萨斯州圣安东尼奥）。受试者：714名6年级学生。结果：添加项目以反映级别水果和蔬菜摄入自我效能（低、中、高）量表的信度和效度与现有量表相当，但项目在潜在变量中的分布没有改善。选择项目之间的集群中的项目在类似的难度水平沿着的潜变量导致了一个简短的规模与心理测量学特征相媲美的完整scale.Conclusions：除了可靠性的缩写规模可以减少参与者的负担。额外的研究是必要的，以产生更好地分布在潜在变量的项目。额外的项目可能需要挖掘克服饮食摄入更多样化障碍的信心。
Objective: To improve an existing measure of fruit and vegetable intake self efficacy by including items that varied on levels of difficulty, and testing a corresponding measure of water intake self efficacy.Design: Cross sectional assessment. Items were modified to have easy, moderate and difficult levels of self efficacy. Classical test theory and item response modeling were applied.Setting: One middle school at each of seven participating sites (Houston TX, Irvine CA, Philadelphia PA, Pittsburg PA, Portland OR, rural NC, and San Antonio TX).Subjects: 714 6(th) grade students.Results: Adding items to reflect level (low, medium, high) of self efficacy for fruit and vegetable intake achieved scale reliability and validity comparable to existing scales, but the distribution of items across the latent variable did not improve. Selecting items from among clusters of items at similar levels of difficulty along the latent variable resulted in an abbreviated scale with psychometric characteristics comparable to the full scale, except for reliability.Conclusions: The abbreviated scale can reduce participant burden. Additional research is necessary to generate items that better distribute across the latent variable. Additional items may need to tap confidence in overcoming more diverse barriers to dietary intake.