Reducing Sun Exposure for Prevention of Skin Cancers: Factorial Invariance and Reliability of the Self-Efficacy Scale for Sun Protection
Reducing Sun Exposure for Prevention of Skin Cancers: Factorial Invariance and Reliability of the Self-Efficacy Scale for Sun Protection
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DOI：
10.1155/2015/862732
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发表时间：
2015-01-01
影响因子：
1.1
通讯作者：
Velicer, Wayne F.
中科院分区：
文献类型：
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作者：
Babbin, Steven F.;Yin, Hui-Qing;Velicer, Wayne F.
防晒自我效能量表由两个相关因素组成，每个因素包括三个项目：使用防晒霜和避免防晒。这项研究评估了两个重要的心理测量学假设，因子不变性和量表可靠性，样本为成年人(N=1356)，参与了一项计算机定制的、基于人群的干预研究。当模型在子组中相同时，度量具有阶乘不变性。检验了三个水平的不变性，从最小到最严格：(1)结构不变性(无限制的非零因素负荷)；(2)模式同一性不变性(相等的因素负荷)；(3)强因素不变性(相等的因素负荷和测量误差)。7个分组变量：年龄、教育程度、种族、性别、种族、肤色和防晒霜的变化阶段，强因素方差非常适合该模型。使用防晒霜的内部一致性系数Alpha和因子Rho量表的可靠性分别为0.84和0.86，回避的内部一致性系数Alpha和因子Rho量表的可靠性分别为0.68和0.70，而全球(总)量表的内部一致性系数Alpha和因子Rho量表的可靠性分别为0.78和0.78。心理测量学证据表明，该量表具有一致性，具有内部效度，可以用来评估以人群为基础的成人样本，这一点得到了强有力的经验支持。
The Self-Efficacy Scale for Sun Protection consists of two correlated factors with three items each for Sunscreen Use and Avoidance. This study evaluated two crucial psychometric assumptions, factorial invariance and scale reliability, with a sample of adults (N = 1356) participating in a computer-tailored, population-based intervention study. A measure has factorial invariance when the model is the same across subgroups. Three levels of invariance were tested, from least to most restrictive: (1) Configural Invariance (nonzero factor loadings unconstrained); (2) Pattern Identity Invariance (equal factor loadings); and (3) Strong Factorial Invariance (equal factor loadings and measurement errors). Strong Factorial Invariance was a good fit for the model across seven grouping variables: age, education, ethnicity, gender, race, skin tone, and Stage of Change for Sun Protection. Internal consistency coefficient Alpha and factor rho scale reliability, respectively, were .84 and .86 for Sunscreen Use, .68 and .70 for Avoidance, and .78 and .78 for the global (total) scale. The psychometric evidence demonstrates strong empirical support that the scale is consistent, has internal validity, and can be used to assess population-based adult samples.