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Related Experiment Video

Updated: Jun 12, 2026

Utilizing Electroencephalography Measurements for Comparison of Task-Specific Neural Efficiencies: Spatial Intelligence Tasks

Utilizing Electroencephalography Measurements for Comparison of Task-Specific Neural Efficiencies: Spatial Intelligence Tasks

Published on: August 9, 2016

A comparative analysis of the Work Ability Index.

P Martus¹, O Jakob, U Rose

¹Institute for Biostatistics and Clinical Epidemiology, Hindenburgdamm 30, 12000 Berlin, Germany. peter.martus@charite.de

Occupational Medicine (Oxford, England)

|June 25, 2010

Summary

The Work Ability Index (WAI) has a two-dimensional structure, not a single one. This finding suggests that using the total WAI score alone is insufficient for assessing work ability.

Related Experiment Videos

Last Updated: Jun 12, 2026

Utilizing Electroencephalography Measurements for Comparison of Task-Specific Neural Efficiencies: Spatial Intelligence Tasks

Utilizing Electroencephalography Measurements for Comparison of Task-Specific Neural Efficiencies: Spatial Intelligence Tasks

Published on: August 9, 2016

Area of Science:

Occupational Health
Psychometrics
Sociology

Background:

The Work Ability Index (WAI) is widely used to measure an individual's capacity to work.
Previous research has yielded conflicting results regarding the underlying structure of the WAI.

Purpose of the Study:

To determine the dimensionality of the Work Ability Index (WAI).
To examine the relationships between factors and subscales within the WAI.

Main Methods:

Factor analysis was employed to investigate the psychometric properties of the WAI.
Statistical fit was assessed using Chi-square analysis and the Comparative Fit Index.
Data from 324 subjects across various occupations were analyzed after excluding a biased subgroup.

Main Results:

A one-factor model and an orthogonal two-factor model did not adequately represent the data.
A two-dimensional model with correlated factors provided a satisfactory fit.
The two factors were interpreted as subjective work ability and objective health status.
Only five of the seven WAI items clearly loaded onto one of the two factors.

Conclusions:

The total score of the Work Ability Index (WAI) is inadequate for population-level analysis and individual assessment.
A two-dimensional structure, encompassing subjective work ability and objective health, should be considered when using the WAI.