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Table 3 Results from mediation and reciprocal effects analyses (N=294)

From: Reciprocal effects of treatment-induced increases in exercise and improved eating, and their psychosocial correlates, in obese adults seeking weight loss: a field-based trial

Predictor Mediator Outcome Path a Path b Path c Path c’ Indirect effect R2
    Coef (SE) Coef (SE) Coef (SE) Coef (SE) Coef (SE)  
        95% CI  
Analysis 1
Treatment ΔFruit & Vegtable ΔExercise .57(.18) 3.33(.64) 4.23(2.04)* 2.23(1.98) 1.89(.70) .10
        .73, 3.53  
Treatment ΔExercise ΔFruit & Vegetable 4.13(2.04)* .03(.01) .57(.18) .46(.17) .10(.06) .12
        .01, .24  
Analysis 2
ΔExercise ΔSelf-efficacy-Eat ΔFruit & Vegetable .71(.09) .02(.00) .03(.01) .01(.01) .01(.00) .19
        .01, .02  
ΔExercise ΔFruit & Vegetable ΔSelf-efficacy-Eat .03(.01) 5.98(1.00) .71(.09) .55(.09) .16(.05) .27
        .08, .26  
Analysis 3
ΔExercise ΔMood ΔFruit & Vegetable -.44(.04) -.03(.01) .03(.01) .01(.01)* .01(.00) .16
        .01, .02  
ΔExercise ΔFruit & Vegetable ΔMood .03(.01) -2.25(.49) -.44(.04) -.38(.04) -.06(.02) .32
        -.09, -.03  
Analysis 4
ΔExercise ΔSelf-regulate-Eat ΔFruit & Vegetable .17(.02) .07(.02) .03(.01) .02(.01) .01(.00) .15
        .01, .02  
ΔExercise ΔFruit & Vegetable ΔSelf-regulate-Eat .03(.01) .78(.19) .16(.02) .15(.02) .02(.01) .31
        .01, .04  
Analysis 5
ΔFruit & Veg ΔExercise self-efficacy ΔExercise .34(.38) .54(.09) 3.46(.63) 3.28(.60) .18(.29) .18
        -.34, .82  
ΔFruit & Veg ΔExercise ΔExer self-efficacy 3.46(.63) .20(.03) .34(.38) -.34(.38) .68(.20) .11
        .36, 1.17  
Analysis 6
ΔFruit & Veg ΔMood ΔExercise -3.58(.52) -.56(.06) 3.46(.63) 1.46(.60)* 2.01(.38) .29
        1.37, 2.84  
ΔFruit & Veg ΔExercise ΔMood 3.46(.63) -.38(.04) -3.58(.52) -2.25(.49) -1.32(.34) .32
        -2.04, -.72  
Analysis 7
ΔFruit & Veg ΔSelf-regulate-Ex ΔExercise 1.96(.26) 1.31(.12) 3.46(.63) .89(.58) 2.57(.59) .37
        1.60, 3.62  
ΔFruit & Veg ΔExercise ΔSelf-regulate-Ex 3.46(.63) .23(.02) 1.96(.23) 1.16(.23) .80(.17) .41
        .46, 1.15  
  1. Note. The Delta symbol (Δ) denotes change from baseline to week 26. Path a = predictor → mediator;
  2. Path b = mediator → outcome; Path c = predictor → outcome; Path c’ = predictor → outcome (controlling for the mediator).
  3. *p < .05, p < .01.
  4. denotes a reciprocal effect between the mediator and outcome variables (resulting from the predictor).