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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 1â—Š

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 2â—Š

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 3â—Š

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 4â—Š

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 6â—Š

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 7â—Š

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. â—Šdenotes a reciprocal effect between the mediator and outcome variables (resulting from the predictor).