Volume 3, Issue 3 (Autumn 2016)                   johe 2016, 3(3): 24-31 | Back to browse issues page

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Charkhandaz Yeganeh R, Alimohammadi I, Abolghasemi J, Damiri Z, Parsazadeh B, Rahmani N. Validity and reliability of Verbal Online Subjective Opinion (VOSO) and Modified Cooper-Harper scales in measuring of mental workload. johe 2016; 3 (3) :24-31
URL: http://johe.umsha.ac.ir/article-1-211-en.html
Validity and reliability of Verbal Online Subjective Opinion (VOSO) and Modified Cooper-Harper scales in measuring of mental workload
Reza Charkhandaz Yeganeh1 , Iraj Alimohammadi * 2, Jamileh Abolghasemi1 , Zabiolah Damiri1 , Bahar Parsazadeh1 , Negar Rahmani3
1- faculty of public health, iran university of medical sciences, tehran, iran
2- faculty of public health, iran university of medical sciences, tehran, iran , irajrastin1@gmail.com
3- faculty of health, Mazandaran university of medical sciences, Sari, iran
Abstract:   (8254 Views)

Introduction: High mental workload is one of the important factors that results in errors in safety and occupational health scope and its measurement has high importance. So, this study aimed to determine validity and reliability of Verbal Online Subjective Opinion (VOSO) and Modified Cooper-Harper (MCH) scales in measuring mental workload.

Methods: This study was conducted on 90 male students of Iran University of Medical Sciences. In this study, the Forward-Backward translation was used for translation of scales. Moreover, Content Validity Ratio (CVR) and Content Validity Index (CVI) were calculated by having suggestion of 6 Ergonomics and Occupational health experts. The Hybrid Memory Search Task software was used to create mental workload. Convergent validity of scales was calculated using correlation of scales with reaction time and then Test-Retest method was used to determine the reliability of scales.

Results: Content and convergent validity of scales were confirmed and correlation of both scales with reaction time were higher than 0.8. Moreover for determination of scales reliabilities, Pearson correlation coefficient between scales values in test and retest trials were 0.86 and 0.91 for VOSO and MCH respectively.

Conclusion: It seems that in regard to confirmation of validity and reliability of VOSO and MCH in this study and their high correlation with reaction time, it can use these scales in measurement of mental workload.

Keywords: Mental workload, Verbal Online Subjective Opinion scale, Modified Cooper-Harper scale
Full-Text [PDF 237 kb]   (2416 Downloads)    
Type of Study: Research Article | Subject: Ergonomics
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