Brazilian Journal of Physical Therapy 25 (2021) 563---572 https://www.journals.elsevier.com/brazilian-journal-of-physical-therapy Brazilian Journal of Physical Therapy ORIGINAL RESEARCH 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 Isabel Oliveira Monteiro a,* , Naama Samai Costa Oliveira a , João Afonso Ruaro b , Diego de Sousa Dantas c , Saionara Maria Aires da Câmara a a Postgraduate Program in Rehabilitation Sciences, Faculty of Health Sciences of Trairi, Universidade Federal do Rio Grande do Norte, Santa Cruz CEP 59200-000, RN, Brazil b Physical Therapy Department, Universidade Estadual do Centro-Oeste, Guarapuava, PR, Brazil c Postgraduate Program in Physical Therapy, Physical Therapy Department, Universidade Federal de Pernambuco, Recife, PE, Brazil Received 14 October 2019; received in revised form 8 January 2021; accepted 24 February 2021 Available online 9 March 2021 KEYWORDS Aging; Health; Physical therapy; Rehabilitation; Validation studies. Abstract 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 Classi- fication 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 perfor- mance (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 environ- mental 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. ∗ Corresponding author. E-mail: isabelom55@hotmail.com (I.O. Monteiro). https://doi.org/10.1016/j.bjpt.2021.02.007 1413-3555/© 2021 Associac ¸˜ ao Brasileira de Pesquisa e P´ os-Graduac ¸˜ ao em Fisioterapia. Published by Elsevier Espa˜ na, S.L.U. All rights reserved.