Journal
JOURNAL OF CLINICAL EPIDEMIOLOGY
Volume 65, Issue 10, Pages 1107-1116Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jclinepi.2012.04.007
Keywords
Breast cancer; Cancer-specific geriatric assessment; Emotional social support; Instrumental social support; Older women; Psychometrics; Reliability; Social support; Social support assessment; Validity
Funding
- National Cancer Institute [CA63028, CA106979, CA/AG 70818, CA84506]
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Objective: Evaluation and validation of the psychometric properties of the eight-item modified Medical Outcomes Study Social Support Survey (mMOS-SS). Study Design and Setting: Secondary analyses of data from three populations: Boston breast cancer study (N = 660), Los Angeles breast cancer study (N = 864), and Medical Outcomes Study (N = 1,717). The psychometric evaluation of the eight-item mMOS-SS compared performance across populations and with the original 19-item Medical Outcomes Study Social Support Survey (MOS-SS). Internal reliability, factor structure, construct validity, and discriminant validity were evaluated using Cronbach's alpha, principal factor analysis (PFA), and confirmatory factor analysis (CFA), Spearman and Pearson correlation, t-test and Wilcoxon rank sum tests. Results: mMOS-SS internal reliability was excellent in all three populations. PFA factor loadings were similar across populations; one factor >0.6, well-discriminated two factor (instrumental/emotional social support four items each) >0.5. CFA with a priori two-factor structure yielded consistently adequate model fit (root mean squared errors of approximation 0.054-0.074). mMOS-SS construct and discriminant validity were similar across populations and comparable to MOS-SS. Psychometric properties held when restricted to women aged >= 65 years. Conclusion: The psychometric properties of the eight-item mMOS-SS were excellent and similar to those of the original 19-item instrument. Results support the use of briefer mMOS-SS instrument; better suited to multidimensional geriatric assessments and specifically in older women with breast cancer. (c) 2012 Elsevier Inc. All rights reserved.
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