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Table 4 Mediating effects on the short-term (pre-post) intervention effects on change in physical activity (PA) behaviors

From: Mediators of physical activity change in a behavioral modification program for type 2 diabetes patients

  Steps/day Self-reported active transport Self-reported PA house + garden Self-reported leisure-time PA Self-reported total PA
τ (SE) 3642.70 (524.40) 98.46 (27.29) 163.97 (76.44) 119.80 (43.47) 336.11 (91.42)
p <.001 .001 .035 .007 <.001
Mediator: change in social norm from family
τ' (SE) 3466.71 (499.45) 79.92 (24.84) 147.59 (71.31) 118.77 (41.17) 311.31 (87.12)
p <.001 .002 .042 .007 .001
τ - τ' 175.99 18.54 16.38 1.03 24.80
t 1.99* 3.35* 1.09 .12 1.41
Proportion mediated 4.8% 18.8%    
Mediator: change in modeling from family
τ' (SE) 3612.85 (516.90) 90.51 (24.55) 146.19 (72.18) 105.11 (41.55) 311.39 (88.35)
p <.001 .001 .046 .014 .001
τ - τ' 29.85 7.95 17.78 14.69 24.72
t .30 1.41 1.20 2.07* 1.42
Proportion mediated     12.2%  
Mediator: coping with relapse
τ' (SE) 3419.58 (516.77) 70.45 (25.11) 146.05 (73.57) 105.50 (42.41) 298.14 (89.00)
p <.001 .006 .051 .015 .001
τ - τ' 223.10 28.01 17.92 14.30 37.97
t 2.36* 4.52* 1.06 2.05* 2.18*
Proportion mediated 6.1% 28.4%   11.9% 11.3%
  1. *p < .05
  2. τ = relationship between intervention condition and outcome measure before adjusting for mediator
  3. τ' = relationship between intervention condition and outcome measure after adjusting for mediator
  4. SE = standard error
  5. Note: in all analyses, the total sample (n = 92, both control group and intervention group) was included