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Internal consistency and validity of a new physical workload questionnaire
S D M Bot1, C B Terwee, D A W M van der Windt
1Institute for Research in Extramural Medicine, VU University Medical Centre, Van der Boechorststraat 7, 1081 BT Amsterdam, Netherlands. s.bot.emgo@med.vu.nl
Occupational and Environmental Medicine
|November 20, 2004
Summary
This study validates a new physical workload questionnaire for employees with musculoskeletal complaints, finding it reliable and valid for assessing heavy work and postures. Further testing in non-symptomatic workers is recommended.
Area of Science:
- Occupational Health
- Psychometrics
- Ergonomics
Background:
- Musculoskeletal complaints are prevalent among employees.
- Accurate assessment of physical workload is crucial for understanding and mitigating these complaints.
- Existing tools may not adequately capture the nuances of physical demands in the workplace.
Purpose of the Study:
- To evaluate the dimensionality, internal consistency, and construct validity of a novel physical workload questionnaire.
- To establish the reliability and accuracy of the questionnaire in a population experiencing musculoskeletal issues.
- To provide a validated tool for assessing physical workload in occupational settings.
Main Methods:
- Factor analysis was employed on data from three distinct groups of employees (n=406, 300, 557) with musculoskeletal disorders.
- Internal consistency of the questionnaire's subscales was assessed using Cronbach's alpha.
- Construct validity was tested by comparing subscale scores across four occupational groups categorized by expected physical workload.
Main Results:
- Factor analysis revealed two primary factors: 'heavy physical work' and 'long lasting postures and repetitive movements'.
- The 'heavy physical work' subscale demonstrated high internal consistency (Cronbach's alpha 0.92-0.93).
- The 'long lasting postures and repetitive movements' subscale also showed good internal consistency (Cronbach's alpha 0.86-0.87), and six of eight validity hypotheses were supported.
Conclusions:
- The new physical workload questionnaire exhibits strong internal structure, internal consistency, and construct validity.
- The findings support the use of this questionnaire for assessing physical workload in employees with musculoskeletal complaints.
- Future research should focus on validating the questionnaire in asymptomatic populations and comparing its performance against objective physical workload measures.