Abstract

Background: Breast cancer, one of the most prevalent cancers in women, negatively affects women's survival and health-related quality of life. Women with breast cancer need to discuss treatment options with their doctors thoroughly in order to make optimal treatment decisions. 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 the SDM-Q-9 was confirmed when the items fit the Rasch model's assumptions of unidimensionality: (1) infit and outfit mean square (MNSQ) ranged from 0.6 to 1.4; (2) the unexplained variance of the first dimension of the principle component analysis (PCA) was < 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 MNSQ ranging from 0.6 to 1.3) and very low unexplained variance of the first dimension (5.3%) of the PCA. The person reliability of the SDM-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 shared decision-making in women with breast cancer for both research and clinical purposes.
Original languageEnglish
Pages221-222
Number of pages2
DOIs
Publication statusPublished - 2018
EventThe 25th Cochrane Colloquium - Edinburgh International Conference Centre, Edinburgh, United Kingdom
Duration: Sep 16 2018Sep 18 2018
Conference number: 25th

Conference

ConferenceThe 25th Cochrane Colloquium
CountryUnited Kingdom
City Edinburgh
Period9/16/189/18/18

Fingerprint

Decision Making
Breast Neoplasms
Women's Health
Reproducibility of Results
Surveys and Questionnaires
SDM
Quality of Life
Therapeutics
Research
Neoplasms

Cite this

Hou, W-H., Wu, T., Huang, T-W., & Hsu, C. (2018). Rasch analysis of the 9-item Shared Decision Making Questionnaire for women with breast cancer. 221-222. Abstract from The 25th Cochrane Colloquium, Edinburgh, United Kingdom. https://doi.org/10.1002/14651858.CD201801

Rasch analysis of the 9-item Shared Decision Making Questionnaire for women with breast cancer. / Hou, Wen-Hsuan; Wu, T.; Huang, Tsai-Wei; Hsu, C.

2018. 221-222 Abstract from The 25th Cochrane Colloquium, Edinburgh, United Kingdom.

Research output: Contribution to conferenceAbstract

Hou, W-H, Wu, T, Huang, T-W & Hsu, C 2018, 'Rasch analysis of the 9-item Shared Decision Making Questionnaire for women with breast cancer' The 25th Cochrane Colloquium, Edinburgh, United Kingdom, 9/16/18 - 9/18/18, pp. 221-222. https://doi.org/10.1002/14651858.CD201801
Hou, Wen-Hsuan ; Wu, T. ; Huang, Tsai-Wei ; Hsu, C. / Rasch analysis of the 9-item Shared Decision Making Questionnaire for women with breast cancer. Abstract from The 25th Cochrane Colloquium, Edinburgh, United Kingdom.2 p.
@conference{3420ee35b106434b8daa844d76898a6c,
title = "Rasch analysis of the 9-item Shared Decision Making Questionnaire for women with breast cancer",
abstract = "Background: Breast cancer, one of the most prevalent cancers in women, negatively affects women's survival and health-related quality of life. Women with breast cancer need to discuss treatment options with their doctors thoroughly in order to make optimal treatment decisions. 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 the SDM-Q-9 was confirmed when the items fit the Rasch model's assumptions of unidimensionality: (1) infit and outfit mean square (MNSQ) ranged from 0.6 to 1.4; (2) the unexplained variance of the first dimension of the principle component analysis (PCA) was < 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 MNSQ ranging from 0.6 to 1.3) and very low unexplained variance of the first dimension (5.3{\%}) of the PCA. The person reliability of the SDM-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 shared decision-making in women with breast cancer for both research and clinical purposes.",
author = "Wen-Hsuan Hou and T. Wu and Tsai-Wei Huang and C. Hsu",
note = "Cochrane Database of Systematic Reviews 2018;(9 Suppl 1); The 25th Cochrane Colloquium ; Conference date: 16-09-2018 Through 18-09-2018",
year = "2018",
doi = "10.1002/14651858.CD201801",
language = "English",
pages = "221--222",

}

TY - CONF

T1 - Rasch analysis of the 9-item Shared Decision Making Questionnaire for women with breast cancer

AU - Hou, Wen-Hsuan

AU - Wu, T.

AU - Huang, Tsai-Wei

AU - Hsu, C.

N1 - Cochrane Database of Systematic Reviews 2018;(9 Suppl 1)

PY - 2018

Y1 - 2018

N2 - Background: Breast cancer, one of the most prevalent cancers in women, negatively affects women's survival and health-related quality of life. Women with breast cancer need to discuss treatment options with their doctors thoroughly in order to make optimal treatment decisions. 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 the SDM-Q-9 was confirmed when the items fit the Rasch model's assumptions of unidimensionality: (1) infit and outfit mean square (MNSQ) ranged from 0.6 to 1.4; (2) the unexplained variance of the first dimension of the principle component analysis (PCA) was < 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 MNSQ ranging from 0.6 to 1.3) and very low unexplained variance of the first dimension (5.3%) of the PCA. The person reliability of the SDM-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 shared decision-making in women with breast cancer for both research and clinical purposes.

AB - Background: Breast cancer, one of the most prevalent cancers in women, negatively affects women's survival and health-related quality of life. Women with breast cancer need to discuss treatment options with their doctors thoroughly in order to make optimal treatment decisions. 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 the SDM-Q-9 was confirmed when the items fit the Rasch model's assumptions of unidimensionality: (1) infit and outfit mean square (MNSQ) ranged from 0.6 to 1.4; (2) the unexplained variance of the first dimension of the principle component analysis (PCA) was < 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 MNSQ ranging from 0.6 to 1.3) and very low unexplained variance of the first dimension (5.3%) of the PCA. The person reliability of the SDM-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 shared decision-making in women with breast cancer for both research and clinical purposes.

UR - https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD201801/full

U2 - 10.1002/14651858.CD201801

DO - 10.1002/14651858.CD201801

M3 - Abstract

SP - 221

EP - 222

ER -