Assessment of the Concurrent Validity of the ICF Core Set to Classify the Physical Health of Community-Dwelling Older Adults in Relation to Self-Rated Health.

BACKGROUND AND PURPOSE: The present study aimed to assess the concurrent validity of the International Classification of Functioning, Disability and Health (ICF) core set to classify physical health of older adults in relation to self-rated health. METHODS: This is a methodological study conducted in Santa Cruz, Rio Grande do Norte (RN) state, in Northeastern Brazil, with 101 community-dwelling older adults. The participants rated their health status, which was classified into 3 groups: very good, fair, and poor/very poor. An interview was then conducted using self-reported and objective measurements to classify physical health according to the ICF core set. It consists of 30 categories, 14 of which belong to the body function (b) component, 4 to body structures (s), 9 to activities and participation (d), and 3 related to environmental factors (e). To analyze the compromised and problematic categories in the ICF, an impairment index was created for each component. The relationship between self-rated health and the impairment indexes was assessed using the multinomial logistic regression test adjusted for age, sex, schooling, and perception of income sufficiency. RESULTS: A greater likelihood of poor or very poor self-rated health was found in older individuals with the highest impairment index in (b) (odds ratio [OR] = 1.18; P < .001); (s) (OR = 1.11; P ≤ .001); (d) capacity (OR = 1.09; P = .02); and (d) performance (OR = 1.08; p = 0.01). CONCLUSION: The results suggest that the ICF core set is a valid instrument to assess the physical health of older adults, since it is associated with self-rated health and shows potential for use in clinical practice and scientific research, with universal language regarding functionality and physical health in older adults.

Convergent validity and reproducibility of the International classification of functioning, disability and health (ICF) core set for the physical health of community-dwelling older adults.

BACKGROUND: Physical health is an important factor for what is considered successful aging. Using valid and reproducible tools to classify PH of older adults may help to develop appropriate rehabilitation protocols for this population. OBJECTIVE: To evaluate the convergent validity and reproducibility of the International Classification of Functioning, Disability and Health (ICF) core set to classify the physical health of older adults. METHODS: A total of 101 older adults were evaluated for handgrip strength, physical performance (Short Physical Performance Battery), and physical activity level (International Physical Activity Questionnaire). Physical health was classified with the ICF core set (14 categories of body functions, 4 of body structures, 9 of activity and participation, and 3 environmental factors) and an impairment index was calculated for each component. RESULTS: Higher levels of physical activity were associated to lower impairment index in the body function and activity and participation components, but was not associated to environmental factors. Better physical performance and handgrip strength were also related to lower impairment index in all components. The Intraclass Correlation Coefficient analysis indicated good reproducibility for body function, body structure, the capacity component of the activity and participation, and for two environmental factors (use of medications and assistive devices), but moderate reproducibility for the performance component of activity and participation, and poor reproducibility for the environmental factor related to access to health services. CONCLUSION: The ICF core set for the physical health of older adults is a valid and reproducible tool and can be used in clinical practice and research.