Skip to main content

Table 2 Effect estimates for confounders in the final adjusted model with and without interaction (N = 4625)

From: Household income, active travel, and their interacting impact on body mass index in a sample of urban Canadians: a Bayesian spatial analysis

  Without interaction With interaction
Mode 1: Non-spatial Model 2: Spatial Model 3: Non-spatial Model 4: Spatial
Independent variables Effect estimate (posterior mean, 95% CrI) Effect estimate (posterior mean, 95% CrI)
Individual variables
 Agea
  35–49 years 0.065 (0.05, 0.079) 0.065 (0.05, 0.08) 0.065 (0.05, 0.079) 0.064 (0.05, 0.079)
  50–64 years 0.091 (0.077, 0.105) 0.092 (0.078, 0.106) 0.092 (0.078, 0.106) 0.092 (0.078, 0.106)
  65 + years 0.089 (0.071,0.106) 0.092 (0.074, 0.109) 0.09 (0.073, 0.108) 0.092 (0.074, 0.109)
 Sexb
  Female  0.068 (− 0.077, − 0.059) − 0.068 (− 0.077, − 0.059) − 0.067 (− 0.077, − 0.059) − 0.068 (− 0.077, − 0.059)
 Physical activityc
  ≥ 3 days in prior week − 0.036 (− 0.046, − 0.025) − 0.035 (− 0.046, − 0.025) − 0.036 (− 0.046, − 0.025) − 0.035 (− 0.046, − 0.025)
 Travel moded
  Mixed vehicular/active travel − 0.021 (− 0.037, − 0.005) − 0.02 (− 0.036, − 0.004) 0.001 (− 0.067, 0.075) 0.005 (− 0.058, 0.072)
  Active travel only − 0.044 (− 0.062,− 0.027) − 0.043 (− 0.06, − 0.025) 0.005 (− 0.049, 0.061) 0.011 (− 0.04, 0.06)
Household variables
  Household incomee
  $25,000–$49,999 − 0.016 (− 0.045, 0.014) − 0.016 (− 0.046, 0.014) 0.002 (− 0.037, 0.044) 0.003 (− 0.032, 0.041)
  $50,000–$74,999 − 0.026 (− 0.054, 0.003) − 0.025 (− 0.054, 0.004) − 0.006 (− 0.043, 0.035) − 0.004 (− 0.038, 0.032)
  ≥ $75,000 − 0.036 (− 0.063,− 0.008) − 0.035 (− 0.063, − 0.007) − 0.014 (− 0.05, 0.026) − 0.012 (− 0.043, 0.024)
Transportation mode * household incomef    
 Mixed vehicular/active travel
  $25,000–$49,999    0.016 (− 0.073, 0.097) 0.013 (− 0.067, 0.091)
  $50,000–$74,999    − 0.017 (− 0.099,0.059) − 0.02 (− 0.095, 0.052)
  ≥ $75,000    − 0.031 (− 0.107, 0.039) − 0.035 (− 0.105, 0.031)
 Active transportation only
  $25,000-$49,999    − 0.056 (− 0.124, 0.011) − 0.059 (− 0.122, 0.005)
  $50,000-$74,999    − 0.048 (− 0.114, 0.018) − 0.052 (− 0.113, 0.009)
  ≥ $75,000    − 0.055 (− 0.115, 0.005) − 0.061 (− 0.115, − 0.007)
 Young childreng
  Children under 5 in home 0.029 (0.01,0.048) 0.027 (0.009, 0.046) 0.029 (0.01, 0.048) 0.027 (0.009, 0.046)
Neighbourhood variables
  Deprivation indexh
  Quintile 2 0.0001 (− 0.017,0.018) − 0.003 (− 0.021, 0.014) − 0.001 (− 0.018, 0.018) − 0.003 (− 0.021, 0.015)
  Quintile 3 0.021 (0.003, 0.04) 0.014 (− 0.006, 0.034) 0.021 (0.003, 0.04) 0.015 (− 0.005,0.034)
  Quintile 4 0.034 (0.014, 0.054) 0.028 (0.006, 0.048) 0.034 ( 0.014, 0.054) 0.028 (0.006, 0.049)
  Quintile 5 (least privileged) 0.053 (0.033, 0.074) 0.042 (0.019, 0.065) 0.053 (0.033, 0.074) 0.043 (0.019, 0.065)
Population density − 0.001 (− 0.009, 0.006) − 0.002 (− 0.009, 0.006) − 0.001 (− 0.008, 0.006) − 0.001 (− 0.009, 0.006)
Road centroids − 0.004 (− 0.008, 0.001) − 0.003 (− 0.007, 0.002) − 0.004 (− 0.008, 0.001) − 0.003 (− 0.007, 0.001)
Can-ALE − 0.006 (− 0.013, − 0.00,001) − 0.005 (− 0.012, 0.002) − 0.007 (− 0.013, − 0.001) − 0.005 (− 0.012, 0.002)
DIC − 3498.21 − 3504.3 − 3495.43 − 3503.87
  1. Italic indicates statistical significance (95% credible Interval does not cover zero)
  2. DIC deviance information criterion. The lower DIC, the better the model fits the data
  3. aAge 19–34 years is reference category
  4. bMale is reference category
  5. c< 3 days in prior week is reference category
  6. dVehicular travel only is reference category
  7. eIncome < $25,000 is reference category
  8. fVehicular travel only with household income < $25,000 is reference category
  9. gNo children under 5 is reference category
  10. hDeprivation quintile 1 (most privileged) is reference category