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Predictive Validity of the Classification Schema for Functional Mobility Tests in Instrumental Activities of Daily Living Decline Among Older Adults
Authors:Hiroyuki Shimada  Patricia Sawyer  Kazuhiro Harada  Satomi Kaneya  Kenji Nihei  Yasuyoshi Asakawa  Chiharu Yoshii  Akiyoshi Hagiwara  Taketo Furuna  Tatsuro Ishizaki
Affiliation:a Research Team for Promoting Independence of the Elderly, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
b Division of Gerontology, Geriatrics, and Palliative Care, University of Alabama at Birmingham, Birmingham, AL
c The Graduate School of Health Science, Kibi International University, Okayama, Japan
d Department of Physical Therapy, Kamma Memorial Hospital, Tochigi, Japan
e Department of Rehabilitation, Aida Hospital, Fukushima, Japan
f Department of Physical Therapy, School of Health Sciences, Faculty of Medicine, Gunma University, Gunma, Japan
g Department of Physical Therapy, Tokyo College of Allied Medicine, Tokyo, Japan
h Department of Physical Therapy, Yokohama Brain and Stroke Center, Kanagawa, Japan
i Department of Physical Therapy, School of Health Sciences, Sapporo Medical University, Hokkaido, Japan
j School of Public Health, Kyoto University Graduate School of Medicine, Kyoto, Japan
Abstract:
Shimada H, Sawyer P, Harada K, Kaneya S, Nihei K, Asakawa Y, Yoshii C, Hagiwara A, Furuna T, Ishizaki T. Predictive validity of the classification schema for functional mobility tests in instrumental activities of daily living decline among older adults.

Objective

To determine predictive validity for cut points of the Timed Up & Go (TUG) test and life-space assessment (LSA) on decline in instrumental activities of daily living (IADLs) among older adults.

Design

Cross-sectional and 1-year follow-up study.

Setting

Preventive health care services.

Participants

In a cross-sectional study, 2404 older adults (65-100y) were recruited to determine cut points for the TUG and LSA for IADLs limitation. For longitudinal analysis, 436 older adults (65-100y) were followed over 1 year to explore the validity of a classification model using the cut points to predict incident IADLs decline.

Interventions

Not applicable.

Main Outcome Measures

The TUG, LSA, and Tokyo Metropolitan Institute of Gerontology index of IADLs measurement.

Results

The cut points associated with IADLs limitations for the TUG and LSA were 12 seconds and 56 points, respectively. Participants were classified into fast/high (most able; TUG <12 and LSA >56), fast/low, slow/high, and slow/low (vulnerable; TUG ≥12 and LSA ≤56) groups; there were 813 (34%), 385 (16%), 246 (10%), and 960 (40%) participants in each group, respectively. The proportions of participants with IADLs limitation in the most able, fast/low, slow/high, and vulnerable groups were 19%, 64%, 61%, and 89%, respectively. The vulnerable group included significantly more participants with IADLs limitation than any other group (P<.001). Compared with a most able group, the odds ratios of IADLs decline for the fast/low and vulnerable groups were 2.52 (95% confidence interval 1.15-5.53, P<.05) and 2.87 (95% confidence interval 1.38-5.96, P<.01), respectively.

Conclusions

The combination of TUG and LSA identifies persons with future IADLs decline and has the potential to be used by community health care services to target individualized interventions.
Keywords:Aged   Functional assessment   Mobility limitation   Physical activity   Rehabilitation   Restricted activity
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