Dehghan Habibollah, Mortzavi Seyed Bagher, Jafari Mohamad Javad, Maracy Mohamad Reza
Department of Occupational Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
Department of Occupational Health Engineering, School of Medicine, Tarbiat Modares University, Tehran,
J Res Health Sci. 2015 Summer;15(3):175-81.
Current heat stress indices are not completely suitable for heat strain screening in developing countries due to their inherent and applied limitations. The aim of this study was development of a questionnaire method entitled "Heat Strain Score Index" (HSSI) in order to perform a preliminary assessment of heat stress at work.
This research included six phases (i) Item generation (ii) Content validity (iii) Reliability analysis (iv)Structure validity (v) Concurrent validity and (vi) Classification of thermal risk level. In item generation phase, 40 items were identified to have impact on the heat strain. Content validity was evaluated by occupational health specialists.
In consistency assessment, Cronbach's coefficient (α) of items was 0.91. Exploratory factor analysis on items HSSI draft identified four subscales which explained 71.6% of the variance. Correlation between the HSSI score with aural temperature was 0.73. Cut-off point; sensitivity and specificity for upper no thermal strain zone were 13.5, 91% and 50%, respectively. Whereas Cut-off point, sensitivity and specificity for lower thermal strain zone were 18, 86% and 73%.
The results showed that 18 variables that were measurable through subjective judgment and observation in the HSSI scale covered heat stress key factors. This scale demonstrated reliability and initial validity in scale were suitable. Therefore HSSI scale for primary evaluation heat stress is appropriate.
由于当前热应激指数存在固有和应用方面的局限性，它们并不完全适用于发展中国家的热应激筛查。本研究的目的是开发一种名为“热应激评分指数”（HSSI）的问卷方法，以便对工作中的热应激进行初步评估。
本研究包括六个阶段：（i）项目生成；（ii）内容效度；（iii）信度分析；（iv）结构效度；（v）同时效度；（vi）热风险水平分类。在项目生成阶段，确定了40个对热应激有影响的项目。内容效度由职业健康专家进行评估。
在一致性评估中，项目的克朗巴哈系数（α）为0.91。对HSSI草案项目进行探索性因素分析，确定了四个子量表，它们解释了71.6%的方差。HSSI得分与耳温之间的相关性为0.73。临界点；上无热应激区的敏感性和特异性分别为13.5、91%和50%。而下热应激区的临界点、敏感性和特异性分别为18、86%和73%。
结果表明，HSSI量表中可通过主观判断和观察测量的18个变量涵盖了热应激的关键因素。该量表在量表中表现出可靠性和初步效度，是合适的。因此，HSSI量表适用于热应激的初步评估。
