Cancer Risk Reduction through Dietary Intervention

描述（由申请人提供）：这个第一阶段的研究将开发和测试一份问卷来测量水果和蔬菜的消费量，人口统计数据，以及基于跨理论模型构建的变量，这些模型是基于经济上处于不利地位的11至14岁黑人青少年的行为变化。由64名青年组成的焦点小组将收集有关项目相关性和详尽性的数据。内容效度将通过专家评审来评估。试点测试将在40名青年中进行，他们将对项目的清晰度、可解释性、相关性、顺序、布局和详尽性进行评分。通过探索性因子分析和内部一致性信度分析来确定问卷各分量表的测量结构和内部一致性。

DESCRIPTION (provided by applicant): This Phase I study will develop and test a questionnaire to measure fruit and vegetable consumption, demographic data, and variables based on constructs from the transtheoretical model of behavior change among economically disadvantaged Black adolescents 11 through 14 years of age. Focus groups with 64 youths will gather data on the relevance and exhaustiveness of items. Content validity will be assessed by subjecting the instrument to expert review. Pilot testing will be carried out with a separate sample of 40 youths who will rate the clarity, interpretability, relevance, order, layout and exhaustiveness of items. Exploratory factor analysis and internal consistency reliability analyses will be performed to confirm the measurement structure and internal consistency of questionnaire subscales. Cross-sectional data from a separate sample of 250 youths will be used to confirm relationships predicted by the model and examine associations between transtheoretical variables, demographic data, and fruit and vegetable consumption. Those data will inform Phase II efforts to develop an intervention based on the model. The efficacy of the intervention will be examined in a randomized clinical trial. Should Phase II prove successful, Phase III will entail its dissemination to community-based agencies similar to those engaged in this R & D project.