Department of Sociology, William Paterson University, Wayne, NJ 07470, USA.
Am J Health Promot. 2012 Jul-Aug;26(6):381-9. doi: 10.4278/ajhp.100903-QUAN-302.
To examine the construct validity and 2-month test-retest reliability of a staging measure for assessing readiness to consume five or more daily servings of fruits and vegetables among economically disadvantaged African-American adolescents.
Longitudinal survey.
Youth services agencies serving low-income communities in New York, New Jersey, and Pennsylvania.
African-American adolescents (N = 390) aged 11 to 14 years.
Self-report measures of stage of change and fruit and vegetable consumption.
Correlation analysis and analysis of covariance were used to examine, cross-sectionally, whether fruit and vegetable consumption differed by stage of change (validity assessment). Correlation analysis and Cohen's kappa (κ) were used to assess the degree of association and level of agreement between stages longitudinally (test-retest reliability assessment).
Fruit and vegetable consumption was moderately correlated with stage of change (r ≥ .54, p = .000). Consistent with the transtheoretical model, youths' consumption increased from earlier to later stages (p = .000). Forty-six percent of youths were in the same stage at both measurements. The correlation between stages was .26, and Cohen's κ was .20 (p = .000).
Despite preliminary evidence of construct validity, the low test-retest reliability found suggests that further research and testing are needed to improve the stability of the measure.
检验一种评估经济困难的非裔美国青少年准备每天食用五份或更多份水果和蔬菜的阶段性评估工具的结构效度和 2 个月的重测信度。
纵向调查。
为纽约、新泽西和宾夕法尼亚低收入社区提供服务的青年服务机构。
11 至 14 岁的非裔美国青少年（N=390）。
阶段变化和水果与蔬菜摄入量的自我报告测量。
相关性分析和协方差分析用于横向评估水果和蔬菜摄入量是否因阶段变化而不同（有效性评估）。相关性分析和 Cohen's kappa（κ）用于纵向评估阶段之间的关联程度和一致性（重测信度评估）。
水果和蔬菜的摄入量与阶段变化呈中度相关（r≥.54，p=0.000）。与跨理论模型一致，青少年的摄入量从早期阶段到后期阶段逐渐增加（p=0.000）。46%的青少年在两次测量中处于相同的阶段。阶段之间的相关性为.26，Cohen's κ为.20（p=0.000）。
尽管有初步的结构效度证据，但发现的低重测信度表明，需要进一步的研究和测试来提高该测量工具的稳定性。
