摘要
目的验证NASA任务负荷指数(NASA-TLX)在中小学教师脑力负荷评价中的信度和效度。方法采用整群随机抽样方法抽取江西省中小学教师共1 285人为样本;采用分半信度、Cronbach’sα系数、θ系数、Ω系数、条目分与总分间的一致性进行信度验证,采用结构效度和项目区分效度评价量表的效度。结果 NASA-TLX量表的分半信度为0.808,Cronbach’sα系数、θ系数和Ω系数分别为0.758,0.782和0.875,各条目得分与总分的相关系数均高于0.50(P<0.001)(除业绩水平外),量表的内部一致性较好;因子分析结果表明,量表具有较好的结构效度;各条目具有较好的项目区分效度,能够区分中小学教师的不同脑力负荷水平(P<0.05)。结论 NASA-TLX量表具有较好的信度与效度,经过适当修订,可作为我国中小学教师脑力负荷评价的有效工具。
Objective To test the reliability and validity of a mental workload assessment scale-National Aeronautic and Space Administration Task Load Index（NASA-TLX） among primary and middle school teachers.Methods Totally 1 285 primary and middle school teachers in Jiangxi province were sampled with randomized cluster sampling.The split-half reliability,Cronbach＇s alpha coefficient,theta coefficient,omega coefficient and correlation coefficients between item score and total score were adopted to test the reliability.The test of validity included the assessment of structure validity and discriminant validity.Results The split-half reliability of NASA-TLX was 0.808.Its Cronbach＇s alpha coefficient,theta coefficient and omega coefficient was 0.758,0.782,and 0.875,respectively.The correlation coefficients between its items score and total score were all more than 0.50（P0.001,except the item of performance）.These results suggested that the scale had good inner consistency.The results of factor analysis showed that NASA-TLX had good structure validity.The items of NASA-TLX had good discriminant validity enough to distinguish different level of mental workload among primary and middle school teachers（P0.05）.Conclusion NASA-TLX has good reliability and validity and could be used as a valid tool to assess mental workload of primary and middle school teachers in China after being revised properly.
出处
《中国公共卫生》
CAS
CSCD
北大核心
2010年第10期1254-1255,共2页
Chinese Journal of Public Health
基金
江西省卫生厅科技计划项目(20073184)
作者简介
作者简介：肖元梅（1972-），女，江西吉安人，副教授，博士，研究方向：职业流行病学。
