1. Improving a Measure of Mobility-Related Fatigue (The Mobility-Tiredness Scale) by Establishing Item Intensity.
- Author
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Fieo, Robert A., Mortensen, Erik L., Rantanen, Taina, and Avlund, Kirsten
- Subjects
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CONFIDENCE intervals , *STATISTICAL correlation , *EPIDEMIOLOGY , *FATIGUE (Physiology) , *GRIP strength , *RESEARCH funding , *STATISTICAL sampling , *SCALES (Weighing instruments) , *DATA analysis , *BODY movement , *MULTITRAIT multimethod techniques , *RESEARCH methodology evaluation , *PHYSICAL activity , *DESCRIPTIVE statistics - Abstract
Objectives To improve the construct validity of self-reported fatigue by establishing a formal hierarchy of scale items and to determine whether such a hierarchy could be maintained across time (aged 75-80), sex, and nationality. Design Cohort study. Setting Two Nordic urban locations: Jyväskylä, Finland, and Glostrup, Denmark. Participants Baseline (1989/90) consisted of a random sample of citizens of Finland or Denmark born in 1914 (n = 837). At 5-year follow-up, excluding those lost to follow-up and with baseline disability resulted in a sample of n = 690. Measurements The Mobility- Tiredness ( Mob- T) Scale is a six-item scale that requires subjects to self-report on whether they become tired performing mobility-related tasks. Employing item response theory, an attempt was made to enhance construct validity by confirming a hierarchy of mobility-related fatigue. Results A formal hierarchy of fatigue tasks, maintained across time, was established using the revised Mob-T Scale. At age 75, the scalability statistics were a homogeneity coefficient ( H) of 0.80 [ABSTRACT FROM AUTHOR]
- Published
- 2013
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