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Interpretability of change in the Nurses Work Functioning Questionnaire: minimal important change and smallest
Fania R Gärtner1, Karen Nieuwenhuijsen, Frank J H van Dijk
1Coronel Institute of Occupational Health, Academic Medical Center, University of Amsterdam, PO Box 22700, 1100 DE Amsterdam, The Netherlands.
Journal of Clinical Epidemiology
|September 15, 2012
Summary
The Nurses Work Functioning Questionnaire (NWFQ) shows limited interpretability for individual changes. Some scales require further evaluation to determine meaningful improvements and detect changes reliably.
Area of Science:
- Nursing research
- Health outcomes assessment
- Psychometrics
Background:
- The Nurses Work Functioning Questionnaire (NWFQ) is used to assess work functioning in healthcare professionals.
- Understanding the minimal important change (MIC) and smallest detectable change (SDC) is crucial for interpreting NWFQ scores.
- Assessing the interpretability of individual changes in NWFQ scores is vital for clinical practice and research.
Purpose of the Study:
- To evaluate the interpretability of individual changes in the NWFQ.
- To determine the minimal important change (MIC) for improvement.
- To calculate the smallest detectable change (SDC) for the NWFQ.
Main Methods:
- Utilized data from a randomized controlled trial with 358 participants at baseline and 3-month follow-up.
- Calculated MIC using mean change and receiver operating characteristics (ROC) curve methods.
- Determined SDC using the standard error of the measurement.
Main Results:
- MIC values varied between 1.5 and 9.5 (mean change) and 3.4 and 41.5 (ROC curve), depending on the method and baseline score.
- SDC values ranged from 7.2 to 17.
- In a high-baseline subgroup, 10 out of 14 MIC values exceeded the SDC, indicating potential issues with change interpretability.
Conclusions:
- Three of seven NWFQ scales demonstrated sufficient interpretability of individual change.
- Interpretability of change for four NWFQ scales remains inconclusive.
- SDC values were generally small relative to the overall scale range.
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