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Rasch Analysis of the 9-Item Shared Decision Making Questionnaire in Women With Breast Cancer
Tzu-Yi Wu1, Cheng-Te Chen, Yi-Jing Huang
1Author Affiliations: Institute of Economics, Academia Sinica, Taipei (Dr Wu); Center for Teacher Education, National Tsing Hua University, Hsinchu (Dr Chen); School of Occupational Therapy, College of Medicine, National Taiwan University, Taipei (Ms Huang and Dr Hsieh); School of Gerontology Health Management and Master Program in Long-term Care, College of Nursing (Dr Hou), and Department of Physical Medicine and Rehabilitation, College of Medicine, School of Medicine (Dr Hou), Taipei Medical University; Department of Physical Medicine and Rehabilitation, Taipei Medical University Hospital (Dr Hou); Departments of Internal Medicine and Occupational and Environmental Medicine, National Cheng Kung University Hospital, Tainan (Dr Wang); Department of Public Health, College of Medicine, National Cheng Kung University, Tainan (Dr Wang); and Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, Taipei (Dr Hsieh), Taiwan.
Background:
Shared decision making (SDM) is a best practice to help patients make optimal decisions by a process of healthcare, especially for women diagnosed with breast cancer and having heavy burden in long-term treatments. To promote successful SDM, it is crucial to assess the level of perceived involvement in SDM in women with breast cancer.
Objective:
The aims of this study were to apply Rasch analysis to examine the construct validity and person reliability of the 9-item Shared Decision Making Questionnaire (SDM-Q-9) in women with breast cancer.
Methods:
The construct validity of SDM-Q-9 was confirmed when the items fit the Rasch model's assumptions of unidimensionality: (1) infit and outfit mean square ranged from 0.6 to 1.4; (2) the unexplained variance of the first dimension of the principal component analysis was less than 20%. Person reliability was calculated.
Results:
A total of 212 participants were recruited in this study. Item 1 did not fit the model's assumptions and was deleted. The unidimensionality of the remaining 8 items (SDM-Q-8) was supported with good item fit (infit and outfit mean square ranging from 0.6 to 1.3) and very low unexplained variance of the first dimension (5.3%) of the principal component analysis. The person reliability of the SDM-Q-8 was 0.90.
Conclusions:
The SDM-Q-8 was unidimensional and had good person reliability in women with breast cancer.
Implications For Practice:
The SDM-Q-8 has shown its potential for assessing the level of perceived involvement in SDM in women with breast cancer for both research and clinical purposes.
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