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Related Experiment Video

Updated: Feb 14, 2026

Measuring the Functional Abilities of Children Aged 3-6 Years Old with Observational Methods and Computer Tools
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Reproducibility of work ability and work functioning instruments.

A van Schaaijk1,2, K Nieuwenhuijsen1,2, M H W Frings-Dresen1,2

  • 1Coronel Institute of Occupational Health, Academic Medical Center, University of Amsterdam, DE Amsterdam, The Netherlands.

Occupational Medicine (Oxford, England)
|February 23, 2018
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Summary

The work ability (WA) instrument showed moderate reliability, while the work functioning (WF) instrument demonstrated good reliability. These findings are crucial for occupational health professionals using these tools to track changes in worker capacity over time.

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Area of Science:

  • Occupational Health
  • Clinimetrics
  • Psychometrics

Background:

  • Work ability (WA) and work functioning (WF) instruments are valuable tools in occupational health.
  • Assessing the reproducibility of these instruments is key for their practical application.
  • Clinimetrics focuses on the quality and performance of measurement instruments.

Purpose of the Study:

  • To evaluate the reproducibility of work ability (WA) and work functioning (WF) instruments.
  • To determine the reliability and agreement of repeated measurements of WA and WF.

Main Methods:

  • 104 Dutch workers completed WA and WF questionnaires twice, with a 7-day interval.
  • Measurements included general, physical, and mental/emotional WA (0-10) and a 49-item WF questionnaire (0-100).
  • Reproducibility was assessed using intraclass correlation coefficients (ICC), standard error of measurement (SEM), and smallest detectable change (SDC).

Main Results:

  • WA questions demonstrated moderate reliability (ICC: 0.52-0.69).
  • The WF instrument showed good reliability (ICC: 0.85).
  • SEM and SDC values were calculated for both WA and WF to quantify measurement error and detectable change.

Conclusions:

  • The WA questions exhibit moderate reliability, whereas the WF instrument shows good reliability.
  • SDC values for both instruments enable occupational health professionals to monitor meaningful changes in worker WA and WF over time.