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Table 3 Descriptive potential mediators, intervention effect on mediators, effect of mediators on mcpm and mediated effect

From: Exploring mediators of accelerometer assessed physical activity in young adolescents in the HEalth In Adolescents study – a group randomized controlled trial

 

Baseline

 

Post-intervention

Mediation analyses

 
 

Control

Intervention

 

Control

Intervention

      
 

(n = 475-480)

(n = 210-215)

 

(n = 483-485)

(n = 210-215)

      

Mediators

Mean (SD)

Mean (SD)

p

Mean (SD)

Mean (SD)

Intervention effect on mediator

p

Effect mediator

p

Mediated effect

p

        

on mcpm

 

ab (95% CI)

 
      

a (95% CI)

 

b (95% CI)

   

Enjoyment

4.09 (0.78)

4.01 (0.76)

.21

3.97 (0.82)

3.86 (0.81)

- 0.07 (-.20; 0.06)

.30

32.78 (10.03; 55.53)

.005

- 2.31 (-6.86; 2.25)

.32

Self-efficacy

3.81 (0.77)

3.83 (0.75)

.70

3.84 (0.83)

3.73 (0.79)

- 0.15 (-.31; 0.01)

.06

42.56 (19.07; 66.06)

<.000

- 6.42 (-13.83; 0.98)

.09

Social support friends

2.92 (1.00)

2.86 (1.07)

.47

2.73 (1.00)

2.70 (0.86)

- 0.02 (-0.16; 0.13)

 

41.56 (21.58; 61.53)

<.000

- 0.67 (-6.74; 5.40)

.83

Social support parents

2.30 (0.78)

2.37 (0.76)

.34

2.23 (0.80)

2.19 (0.74)

- 0.03 (-16; 0.10)

.62

9.60 (-17.30; 36.50)

.49

- 0.30 (-1.69; 1.11)

.68

Social support teachers

1.67 (0.72)

1.79 (0.83)

.08

1.43 (0.57)

1.56 (0.66)

0.12 (0.02; 0.21)

.02

- .13 (-31.81; 31.57)

.99

- 0.02 (-3.75; 3.73)

.99

Environmental opportunities

4.22 (0.80)

4.26 (0.82)

.54

4.08 (0.89)

4.18 (0.89)

0.11 (-0.04; 0.26)

.15

15.53 (-5.61; 36.67)

.15

1.72 (153; 4.98)

.29

  1. Mcpm = mean count per minute.
  2. Baseline differences between the potential mediators were tested with independent t-test.
  3. Significant results in bold.