Dimensionality and Reliability of the Self-Care of Heart Failure Index Scales: Further Evidence From Confirmatory Factor Analysis
Dimensionality and Reliability of the Self-Care of Heart Failure Index Scales: Further Evidence From Confirmatory Factor Analysis
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DOI：
10.1002/nur.21623
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发表时间：
2014-12-01
影响因子：
2
通讯作者：
Riegel, Barbara
中科院分区：
文献类型：
--
作者：
Barbaranelli, Claudio;Lee, Christopher S.;Riegel, Barbara
心衰自我护理指数（SCHFI）被广泛使用，但可靠性问题已经很明显。Cronbach alpha系数通常用于评估信度，但这种方法假设是一维的。本文的目的是解决的维度和内部一致性的可靠性SCHFI。这是对629名心力衰竭患者的数据进行的二次分析，这些患者参加了在美国东北部和西北部进行的三项独立研究。在使用验证性因子分析测试量表维度后，使用系数alpha和替代选项测试信度。验证性因子分析表明：(a)自我照顾维持量表具有多维的四因子结构；(b)自我照顾管理量表具有双因子结构，但主要因子在共同的高阶因子上负载；(c)自我照顾信心量表是单向度的。用与每个量表的维度相兼容的方法获得的三个量表的信度估计是足够的或高的。分析结果表明，维数和可靠性问题是不可分割的。必须使用与量表维度相一致的适当的可靠性估计。在SCHFI的情况下，由于自我护理维持和自我护理管理量表的多维性，不应使用alpha系数来评估其信度。在进行心理测量评估时，我们建议在评估信度之前测试维度，以及使用多个信度指标，如基于模型的内部一致性，复合信度，以及ω和最大信度系数。(c) 2014 Wiley期刊公司
The Self-Care of Heart Failure Index (SCHFI) is used widely, but issues with reliability have been evident. Cronbach alpha coefficient is usually used to assess reliability, but this approach assumes a unidimensional scale. The purpose of this article is to address the dimensionality and internal consistency reliability of the SCHFI. This was a secondary analysis of data from 629 adults with heart failure enrolled in three separate studies conducted in the northeastern and northwestern United States. Following testing for scale dimensionality using confirmatory factor analysis, reliability was tested using coefficient alpha and alternative options. Confirmatory factor analysis demonstrated that: (a) the Self-Care Maintenance Scale has a multidimensional four-factor structure; (b) the Self-Care Management Scale has a two-factor structure, but the primary factors loaded on a common higher-order factor; and (c) the Self-Care Confidence Scale is unidimensional. Reliability estimates for the three scales, obtained with methods compatible with each scale's dimensionality, were adequate or high. The results of the analysis demonstrate that issues of dimensionality and reliability cannot be separated. Appropriate estimates of reliability that are consistent with the dimensionality of the scale must be used. In the case of the SCHFI, coefficient alpha should not be used to assess reliability of the self-care maintenance and the self-care management scales, due to their multidimensionality. When performing psychometric evaluations, we recommend testing dimensionality before assessing reliability, as well using multiple indices of reliability, such as model-based internal consistency, composite reliability, and omega and maximal reliability coefficients. (c) 2014 Wiley Periodicals, Inc.