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Table 4 Prospective mediation analyses for the association between social environment variables (2004) and BMI (2006) using multi-level linear regression analysis

From: The neighborhood social environment and body mass index among youth: a mediation analysis

   BMI in 2006
  Association between social environment variables and potential mediators
(a)(95% CI)
Association between potential mediators and BMI(b)(95%CI) Direct effect on BMI adjusting for mediators
(c')
(95%CI)
Mediated effect
(a*b)
(95%CI)
Social network     
Screen-time
(mins/day)
-9.88 (-20.57, 0.81) 0.004 (0.000; 0.008) -0.52 (-0.92; -0.11) -0.040 (-0.097; 0.02)
% sedentary time 0.05 (-0.49; 0.59) -0.027 (-0.11; 0.06) -0.41 (-0.84; 0.02) -0.001 (-0.02; 0.01)
% MVPA time 0.39 (0.09; 0.69) -0.05 (-0.19; 0.10) -0.39 (-0.82; 0.04) -0.018 (-0.08; 0.04)
Time spent outdoors
(mins/day)
13.54 (7.10, 19.99) 0.003 (-0.003; 0.009) -0.58 (-0.98; -0.18) 0.041 (-0.04; 0.12)
Number of walking/cycling trips (per week) 1.23 (0.03,2.57) 0.002 (-0.027, 0.031) -0.52 (-0.92, -0.13) 0.003 (-0.036, 0.041)
Social trust & cohesion     
Screen-time
(mins/day)
-4.75 (-18.66, 9.17) 0.004 (0.000; 0.008) -0.49 (-1.02; 0.04) -0.019 (-0.08; 0.04)
% sedentary time 0.097 (-0.62; 0.82) -0.03 (-0.11; 0.06) -0.37 (-0.95; 0.22) -0.003 (-0.03; 0.02)
% MVPA time 0.09 (-0.32; 0.49) -0.07 (-0.22; 0.08) -0.36 (-0.94; 0.22) -0.006 (-0.04; 0.02)
Time spent outdoors
(mins/day)
1.59 (-7.04, 10.22) 0.001 (-0.005; 0.007) -0.49 (-1.01; 0.03) 0.002 (-0.01; 0.014)
Number of walking/cycling trips (per week) 0.27 (-1.38, 1.92) 0.0 (-0.03, 0.03) -0.52 (-1.03, -0.003) 0.0 (-0.008, 0.008)
  1. 95%CI = 95% confidence intervals
  2. BOLD = significant associations
  3. Models were adjusted for age and gender