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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.