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Table 3 Cross-sectional mediation analyses for the association between social environment variables (2004) and BMI (2004) using multi-level linear regression analysis

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

   BMI in 2004
  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) -13.65 (-23.61, -3.68) 0.005 (0.001, 0.009) -0.70 (-1.06, -0.34) -0.07 (-0.14, 0.005)
% sedentary time -0.098 (-0.59; 0.40) 0.001 (-0.07; 0.07) -0.59 (-0.97; -0.20) 0.00 (-0.007; 0.007)
% MVPA time 0.38 (0.10; 0.66) -0.074 (-0.21; 0.06) -0.56 (-0.95; -0.17) -0.03 (-0.08; 0.03)
Time spent outdoors (mins/day) 13.88 (7.89, 19.87) 0.002 (-0.004, 0.008) -0.73 (-1.08, -0.37) 0.03 (-0.055, 0.11)
Number of walking/cycling trips (per week) 1.04 (-0.69, 2.76) 0.007 (-0.01, 0.03) -0.71 (-1.06, -0.36) 0.007 (-0.015, 0.029)
Social trust & cohesion     
Screen-time
(mins/day)
-10.76 (-23.60, 2.09) 0.005 (0.001, 0.009) -0.58 (-1.04, -0.11) -0.054 (-0.13, 0.02)
% sedentary time 0.30 (-0.35; 0.95) 0.003 (-0.07; 0.08) -0.45 (-0.96; 0.06) 0.001 (-0.02; 0.02)
% MVPA time -0.055 (-0.42; 0.31) -0.098 (-0.23; 0.04) -0.44 (-0.97; 0.06) 0.005 (-0.03; 0.04)
Time spent outdoors
(mins/day)
-1.66 (-9.68, 6.36) -0.000 (-0.006, 0.006) -0.48 (-0.95, -0.02) 0.000 (-0.01, 0.01)
Number of walking/cycling trips (per week) 0.27 (-1.83, 2.37) 0.007 (-0.01, 0.03) -0.59 (-1.04, -0.13) 0002 (-0.01, 0.02)
  1. 95%CI = 95% confidence intervals
  2. BOLD = significant associations
  3. Models were adjusted for age and gender