Volume 12, Issue 5 (September-October 2013)
Payesh 2013, 12(5): 535-543 |
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Ali Asghar Arastoo, Ali Montazeri, Mahboubeh Abdolalizadeh, Roya Ghasemzadeh, Kambiz Ahmadi, Ahmad Azizi. Psychometric properties of Persian version of the Work Ability Index questionnaire. Payesh 2013; 12 (5) :535-543
URL: http://payeshjournal.ir/article-1-353-en.html
URL: http://payeshjournal.ir/article-1-353-en.html
Ali Asghar Arastoo1 
, Ali Montazeri2 , Mahboubeh Abdolalizadeh1 , Roya Ghasemzadeh1 , Kambiz Ahmadi1 , Ahmad Azizi1
, Ali Montazeri2 , Mahboubeh Abdolalizadeh1 , Roya Ghasemzadeh1 , Kambiz Ahmadi1 , Ahmad Azizi1
1- School of Rehabilitation Sciences of Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
2- Mental Health Research Group, Health Metrics Research Center, Iranian Institute for Health Sciences Research, ACECR, Tehran, Iran
2- Mental Health Research Group, Health Metrics Research Center, Iranian Institute for Health Sciences Research, ACECR, Tehran, Iran
Abstract: (6154 Views)
Objective (s): To evaluate the psychometric properties of the Persian version of Work Ability Index questionnaire (WAI).
Methods: In this methodological study, a sample of nurses and healthcare staff aged 40 years and above working in educational hospitals in Ahvaz (236 workers) in 2010, completed the questionnaire. Forward-backward method was applied to translate the questionnaire from English into Persian. The psychometric properties of Persian version of the WAI were assessed using the fallowing tests: Internal consistency and test-retest analysis (to test reliability), exploratory factor analysis, discriminant validity and convergent validity by determining the correlation between the Persian version of Short Form Health Survey (SF-36) and WAI score.
Results: The Cronbach’s alpha coefficient was estimated to be 0.79 and the ICC was 0.83. Factor analysis indicated three factors: self-perceived work ability (24.5% of the variance), mental resources (22.23% of the variance), and presence of disease and health related limitation (18.55% of the variance). Statistical tests showed that the questionnaire was capable of discriminating two groups of employees who had different levels of sick leave. Convergent validity analysis showed that the instrument significantly correlated with all dimensions of Persian version of SF-36. Item-scale correlation corrected for overlap showed the items had a good correlation except for item.
Conclusion: The finding showed that the Persian version of Work Ability Index is a reliable and valid measure of work ability and can be used both in research and practice.
Methods: In this methodological study, a sample of nurses and healthcare staff aged 40 years and above working in educational hospitals in Ahvaz (236 workers) in 2010, completed the questionnaire. Forward-backward method was applied to translate the questionnaire from English into Persian. The psychometric properties of Persian version of the WAI were assessed using the fallowing tests: Internal consistency and test-retest analysis (to test reliability), exploratory factor analysis, discriminant validity and convergent validity by determining the correlation between the Persian version of Short Form Health Survey (SF-36) and WAI score.
Results: The Cronbach’s alpha coefficient was estimated to be 0.79 and the ICC was 0.83. Factor analysis indicated three factors: self-perceived work ability (24.5% of the variance), mental resources (22.23% of the variance), and presence of disease and health related limitation (18.55% of the variance). Statistical tests showed that the questionnaire was capable of discriminating two groups of employees who had different levels of sick leave. Convergent validity analysis showed that the instrument significantly correlated with all dimensions of Persian version of SF-36. Item-scale correlation corrected for overlap showed the items had a good correlation except for item.
Conclusion: The finding showed that the Persian version of Work Ability Index is a reliable and valid measure of work ability and can be used both in research and practice.
Keywords: Work Ability Index questionnaire, psychometric properties, reliability, validation study, work ability, Iran
type of study: Descriptive |
Accepted: 2012/06/13 | ePublished ahead of print: 2013/05/20 | Published: 2013/09/15
Accepted: 2012/06/13 | ePublished ahead of print: 2013/05/20 | Published: 2013/09/15
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