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Table 5 Mediating effects on the intermediate-term (pre-follow up) 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) 2491.98 (617.29) 51.41 (28.61) 190.78 (61.62) 55.62 (29.08) 283.46 (62.76)
p < .001 .076 .003 .059 <.001
Mediator: change in self-efficacy towards barriers of PA
τ' (SE) 2313.21 (684.59) 32.15 (32.69) 178.66 (71.05) 46.82 (32.95) 253.65 (71.46)
p .001 .329 .014 .160 .001
τ - τ' 178.77 19.26 12.12 8.80 29.81
t 1.11 3.16* .70 1.12 2.00*
Proportion mediated   44.3%    10.5%
Mediator: change in social support from family
τ' (SE) 2331.57 (698.80) 36.24 (33.52) 146.75 (70.91) 40.21 (33.07) 226.30 (69.31)
p .001 .283 .042 .228 .002
τ - τ' 160.41 15.27 44.03 15.41 57.16
t 1.07 2.37* 2.54* 2.16* 4.07*
Proportion mediated   29.5% 23.1% 27.7% 20.2%
Mediator: coping with relapse
τ' (SE) 2419.71 (662.78) 36.83 (30.89) 205.54 (67.33) 52.28 (31.38) 277.75 (68.40)
P <.001 .237 .003 .100 <.001
τ - τ' 72.27 14.58 -14.76 3.34 5.71
t .55 2.06* .96 .49 .37
Proportion mediated   28.4%    
  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