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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).
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International Journal of Behavioral Nutrition and Physical Activity

ISSN: 1479-5868

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