Development of a Vaccine Advocacy Scale for Childhood Vaccines and Psychometric Evaluation: A Methodological Study

IF 2.1 4区 医学 Q3 HEALTH CARE SCIENCES & SERVICES
Deniz S. Yorulmaz Demir
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引用次数: 0

Abstract

Aim

This study developed the Vaccine Advocacy Scale for childhood vaccines for adults and evaluated its psychometric properties.

Method

This methodological study involved 211 adults. A literature review was conducted to create the item pool of the scale, and 12 items were prepared. While evaluating the scale's psychometric properties, the researchers performed content validity, explanatory factor analysis (factor loadings of the items, eigenvalues of the sub-dimensions, and explained variance rates), confirmatory factor analysis (factor loadings and common fit indices), and criterion validity (predictive validity) in the validation phase. In the predictive validity assessment, the distribution of scores on the scale was examined according to some behaviours related to vaccine advocacy. Additionally, we analysed the item-total score correlation, Cronbach's alpha coefficient, and split-half test consistency in the reliability phase.

Results

The study's calculated Kaiser-Meyer-Olkin value was 0.868, and Bartlett's test of sphericity resulted in significant results (X2 = 1724.166; p < 0.001). The explanatory factor analysis revealed that the items' factor loadings were between 0.451 and 0.949 and explained 58.29% of the total variance of the structure, which consisted of 12 items and two sub-dimensions. The confirmatory factor analysis found the factor loadings of the items between 0.62 and 0.85 and identified ‘common fit indices’ within acceptable ranges and close to the perfect fit values (X2/df, GFI, CFI, RMSEA, RMR, NFI, TLI and IFI were 1.906, 0.950, 0.952, 0.093, 0.059, 0.906, 940 and 0.953, respectively). The Cronbach's alpha value for the scale was 0.92, and the Spearman-Brown coefficient, Guttman's split-half coefficient, and split-half correlation coefficients were 0.843, 0.842 and 0.713, respectively. The study findings indicated that individuals who had talked to other parents about vaccines, recommended vaccinations, and communicated vaccine-related issues with medical professionals had significantly higher total scale scores (p < 0.005).

Conclusion

Considering the study findings and evaluations, the Vaccine Advocacy Scale was a valid and reliable measurement tool to assess adults’ vaccine advocacy behaviour for childhood vaccines.

儿童疫苗和心理测量评估的疫苗倡导量表的开发:一项方法学研究
目的编制成人儿童疫苗宣传量表,并对其心理测量特性进行评价。方法对211名成人进行方法学研究。通过文献综述建立量表题库,共编制12个题项。在评估量表的心理测量特性时,研究者在验证阶段进行了内容效度、解释因子分析(条目的因子负荷、子维度的特征值和解释方差率)、验证性因子分析(因子负荷和常见拟合指标)和标准效度(预测效度)。在预测效度评估中,根据与疫苗宣传相关的一些行为来检查量表得分的分布。此外,我们还分析了信度阶段的项目总分相关性、Cronbach's alpha系数和劈开半检验一致性。结果本研究计算的Kaiser-Meyer-Olkin值为0.868,Bartlett球性检验结果显著(X2 = 1724.166;p < 0.001)。解释因子分析显示,各项目的因子负荷在0.451 ~ 0.949之间,解释了结构总方差的58.29%,该结构由12个项目和两个子维度组成。验证性因子分析发现,各项目的因子负荷在0.62 ~ 0.85之间,“共同拟合指数”在可接受范围内,接近完美拟合值(X2/df、GFI、CFI、RMSEA、RMR、NFI、TLI和IFI分别为1.906、0.950、0.952、0.093、0.059、0.906、940和0.953)。量表的Cronbach’s alpha值为0.92,Spearman-Brown系数、Guttman’s split-half系数和split-half相关系数分别为0.843、0.842和0.713。研究结果表明,与其他家长谈论疫苗、推荐疫苗接种并与医疗专业人员沟通疫苗相关问题的个体,其总量表得分显著较高(p < 0.005)。结论从研究结果和评价来看,疫苗倡导量表是评估成人对儿童疫苗倡导行为的有效、可靠的测量工具。
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来源期刊
CiteScore
4.80
自引率
4.20%
发文量
143
审稿时长
3-8 weeks
期刊介绍: The Journal of Evaluation in Clinical Practice aims to promote the evaluation and development of clinical practice across medicine, nursing and the allied health professions. All aspects of health services research and public health policy analysis and debate are of interest to the Journal whether studied from a population-based or individual patient-centred perspective. Of particular interest to the Journal are submissions on all aspects of clinical effectiveness and efficiency including evidence-based medicine, clinical practice guidelines, clinical decision making, clinical services organisation, implementation and delivery, health economic evaluation, health process and outcome measurement and new or improved methods (conceptual and statistical) for systematic inquiry into clinical practice. Papers may take a classical quantitative or qualitative approach to investigation (or may utilise both techniques) or may take the form of learned essays, structured/systematic reviews and critiques.
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