Factors associated with low levels of physical activity among elderly residents in a small urban area in the interior of the Brazilian Amazon - Freire Junior, Renato Campos; Fernandes, Tiótrefis Gomes; Borges, Grasiely Faccin; Guerra, Ricardo Oliveira; Abreu, Daniela Cristina Carvalho de (Archives of Gerontology and Geriatrics, 2018)