학술논문
Intraclass Correlation Coefficients for Planning Cluster Randomized Trials in Community-Dwelling Older Adults.
Document Type
Article
Author
Source
Subject
*CLUSTER analysis (Statistics)
*COGNITIVE testing
*GERIATRIC assessment
*LIFE skills
*SELF-evaluation
*SAMPLE size (Statistics)
*SECONDARY analysis
*RANDOMIZED controlled trials
*INDEPENDENT living
*STATISTICAL models
*INTRACLASS correlation
*OLD age
RESEARCH evaluation
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Language
ISSN
0898-2643
Abstract
Objectives: With the emerging trends, more cluster randomized trials will be conducted in older adults, where facilities are randomized rather than individuals. Similarity of individuals from a facility (intraclass correlation coefficient/ICC) plays a critical role, but not readily available. We document ICCs for measures commonly used in community-dwelling older adults and discuss implications. Method: Secondary analysis of a range of baseline measures from the On the Move cluster randomized trial, whose ICCs were computed using a linear mixed model. Results: Self-reported disability measures related to facility characteristics and sense of community had the greatest ICCs (>0.10), while mobility performance measures had 0.05 to 0.10, and cognitive measure 0.11. Discussion: The ICCs for measures commonly used in older adults are of a sufficient magnitude to have a substantial impact on planned sample size of a study and credibility of results, and should be taken into consideration in study planning and data analysis. [ABSTRACT FROM AUTHOR]