一般自我效能量表在医学研究生中的适用性评价与应用

Applicability assessment and application of the general self-efficacy scale among medical postgraduates

目的利用经典测量理论和项目反应理论对一般自我效能量表(general self-efficacy scale,GSES)在医学研究生中的信度、结构效度和条目特征进行评价分析。方法对北京市6所综合三甲医院的1021名医学研究生进行问卷调查,内容包括一般人口学特征与一般自我效能感。利用SPSS 24.0软件进行统计分析。利用克朗巴赫系数(Cronbach’sα系数)和组内相关系数分析内部一致性,使用因子分析方法探索量表的维度结构,使用等级模型的项目反应理论对量表10个条目的难度和区分度进行参数估计。结果量表的整体克朗巴赫系数为0.92。平行分析主成分法和验证性因子分析均支持GSES的单维性结构。10个条目的区分度为1.82~3.65,难度为-3.51~1.66,且呈单调递增。该量表在医学研究生中的最大测验信息量为19.16。结论一般自我效能量表具有良好的信度、结构效度和测量精度,在医学研究生调查中具有较好的适用性,但具体条目的难度偏低,可进一步优化完善。

Objective To assess the reliability,constructive validity and item characteristics of the general self-efficacy scale(GSES)among Chinese medical postgraduates using classical test theory and item response theory.Methods A questionnaire survey was conducted among 1021 medical postgraduates from 6 comprehensive levelⅢA hospitals in Beijing.Demographic characteristics and general self-efficacy were investigated.SPSS 24.0 software was used for statistical analysis.Internal consistency of the GSES was evaluated using Cronbach’sαcoefficient and intraclass correlation coefficient.Factor analyses were implemented to test the structure of the scale.An item response theory(IRT)framework with a graded response model was performed to estimate the parameters of each item.Results The overall Cronbach’sαcoefficient of the GSES was 0.92.Parallel analysis and confirmatory factor analysis supported the unidimensional structure of the GSES.The discrimination parameter of the 10 items ranged from 1.82 to 3.65,and the difficulty parameter ranged from-3.51 to 1.66,with a monotonically increasing trend.The maximum test information of the scale among medical postgraduates was 19.16.Conclusion The GSES has good reliability,validity and measurement precision,showing a good applicability in the survey of medical postgraduates.However,the difficulty of specific items is relatively low,and the scale may be further optimized and improved.