Rasch Analysis of the 9-Item Shared Decision Making Questionnaire in Women With Breast Cancer.

Abstract:

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.

journal_name

Cancer Nurs

journal_title

Cancer nursing

authors

Wu TY,Chen CT,Huang YJ,Hou WH,Wang JD,Hsieh CL

doi

10.1097/NCC.0000000000000607

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

E34-E42

issue

3

eissn

0162-220X

issn

1538-9804

journal_volume

42

pub_type

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