title: Prevalence of low back pain and associated factors in adults from a middle-size Brazilian city.
abstract: OBJECTIVE
  To determine the prevalence of low back pain and some related variables among adults of both genders.
  
  
  METHODS
  Was conduct a cross-sectional study of population-based in the urban area of Presidente Prudente, São Paulo. The sample consisted of 743 adult residents for over two years in this city. Low back pain, quality of sleep and physical activity were collected through face to face interview at the residence of respondents. Was used the chi-square test to analyze the association between variables, later was created tree multivariate models with hierarchical inclusion of confounding factors.
  
  
  RESULTS
  The prevalence of low back pain reported last year was 50.2% (95% CI: 46.6, 53.8), and the last week 32.3% (95% CI: 28.9, 35.6). Was association among low back pain and females (p-value = 0.031), older age, lower education, altered sleep and overweight, the adjusted model found that people over the age of 45 years (45 to 59.9 years, OR = 13.1 [1.72-98.5] and ≥ 60 years, OR = 9.10 [1.15-71.7]), with some alteration of sleep (OR = 3.21 [1.84-5.61]) and obese (OR = 2.33 [1:26 to 4:33]) seems to be a risk group for low back pain.
  
  
  CONCLUSIONS
  The prevalence of low back pain is high and obese people aged over 45 years, with any sleep disturbance are a group at higher risk for low back pain.
authors.affiliation: Departamento de Educação Física, Universidade Estadual Paulista, Presidente Prudente, SP, Brasil, everton@unoeste.br.
authors.forename: Everton Alex Carvalho
authors.initials: EA
authors.lastname: Zanuto
authors.affiliation: Departamento de Educação Física, Universidade Estadual Paulista, Presidente Prudente, SP, Brasil, everton@unoeste.br.
authors.forename: Jamile Sanches
authors.initials: JS
authors.lastname: Codogno
authors.affiliation: Departamento de Educação Física, Universidade Estadual Paulista, Presidente Prudente, SP, Brasil, everton@unoeste.br.
authors.forename: Diego Giulliano Destro
authors.initials: DG
authors.lastname: Christófaro
authors.affiliation: Departamento de Fisioterapia, Faculdade de Ciências e Tecnologia de Presidente Prudente, Brasil.
authors.forename: Luiz Carlos Marques
authors.initials: LC
authors.lastname: Vanderlei
authors.affiliation: Departamento de Fisioterapia, Universidade Estadual de Londrina, Brasil.
authors.forename: Jefferson Rosa
authors.initials: JR
authors.lastname: Cardoso
authors.affiliation: Departamento de Educação Física, Universidade Estadual Paulista, Presidente Prudente, SP, Brasil, everton@unoeste.br.
authors.forename: Romulo Araújo
authors.initials: RA
authors.lastname: Fernandes
mesh_terms: D000293:Adolescent; D000328:Adult; D001938:Brazil / Q000453:epidemiology; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D017116:Low Back Pain / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors; D014504:Urban Health; D055815:Young Adult