title: Behavioral mediators of the association between neighborhood environment and weight status in Nigerian adults.
abstract: OBJECTIVE
  Neighborhood built environments are related to obesity and physical activity (PA), but inconsistently to sedentary behaviors. This study investigated the mediating effects of PA and sedentary time on the associations of neighborhood environmental factors and body mass index (BMI) among Nigerian adults.
  
  
  METHODS
  The study design was cross-sectional.
  
  
  METHODS
  The study setting was metropolitan Maiduguri, Nigeria.
  
  
  METHODS
  Nigerian adults (n = 1411) were randomly selected from diverse neighborhoods and had complete data (43.1% women, 33.8% overweight or obese).
  
  
  METHODS
  PA, sedentary time, and 16 perceived neighborhood environmental factors were measured using Nigerian adaptations of validated international questionnaires. Outcomes were measured BMI and interviewer-led self-reports of moderate to vigorous PA, walking, total PA, and sitting time.
  
  
  METHODS
  The product-of-coefficient test using generalized linear models was used to assess the mediating effects of outcomes on the associations between environmental factors and BMI.
  
  
  RESULTS
  Walking and total PA significantly mediated the association between BMI and perception of higher residential density (αβ = -.025 and -.037, respectively), absence of garbage (αβ = -.046 and -.076, respectively), and more safety from crime at night (αβ = -.044 and -.083, respectively). In addition, walking, moderate to vigorous PA, and total PA significantly mediated the association between BMI and perception of better aesthetics (αβ = -.035, -.022, and -.071, respectively). Sedentary time was not a significant mediator of any associations between environmental factors and BMI.
  
  
  CONCLUSIONS
  The association of several neighborhood environmental variables with BMI was partially mediated by PA in Nigerian adults. Including questions on specific types of sedentary behaviors in future prospective studies may improve understanding of the relative influence of sedentary behavior and physical activity on obesity control and prevention among sub-Saharan African adults.
authors: Department of Physiotherapy, College of Medical Sciences, University of Maiduguri, Maiduguri, Nigeria. alaoyeyemi@yahoo.com
authors: Adewale L
authors: AL
authors: Oyeyemi
authors: Benedicte
authors: B
authors: Deforche
authors: James F
authors: JF
authors: Sallis
authors: Ilse
authors: I
authors: De Bourdeaudhuij
authors: Delfien
authors: D
authors: Van Dyck
mesh_terms: D000328:Adult; D000368:Aged; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D004779:Environment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D009549:Nigeria / Q000453:epidemiology; D009765:Obesity / Q000453:epidemiology*; D050177:Overweight / Q000453:epidemiology; D012111:Residence Characteristics; D057185:Sedentary Behavior; D055815:Young Adult