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Table 4 Effect on mediators, effect of mediators on mcpm, mediated effect and moderated mediation of gender

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

Mediators Gender Intervention effect p Intervention effect p Mediated effect p Moderated mediation p
   on mediator   on mcpm   ab (95% CI)    
   a (95% CI)   b (95% CI)     Δab (95% CI)  
Enjoyment Girls - 0.12 (-0.32; 0.07) .19 24.40 (-4.73; 53.54) .10 - 3.03 (-8.62; 2.56) .29 - 3.81 (-10.58; 2.96) .27
  Boys 0.02 (-0.20; 0.24) .85 37.06 (1.18; 72.93) .04 0.78 (-7.24; 8.80) .85   
Self-efficacy Girls - 0.13 (-0.32; 0.06) .18 64.37 (33.84; 94.89) <.000 - 8.17 (-20.38; 4.04) .19 - 5.06 (-15.28; 5.16) .33
  Boys - 0.14 (-0.36; 0.07) .19 21.76 (-14.13; 57.64) .23 - 3.11 (-10.00; 3.80) .38   
Social support friends Girls - 0.02 (-0.16; 0.21) .81 20.51 (-5.14; 46.15) .12 0.46 (-3.33; 4.25) .81 2.47 (-7.93; 12.86) .64
  Boys - 0.03(-0.28; 0.21) .80 61.71 (30.24; 93.17) <.000 - 2.01 (-17.09; 13.08) .79   
Social support parents Girls 0.01 (-0.16; 0.17) .91 - 2.99 (-38.40; 32.41) .88 - 0.03 (-0.59; 0.54) .99 1.10 (-4.77; 6.97) .71
  Boys - 0.03 (-0.26; 0.21) .80 27.21 (-14.14; 68.56) .20 - 1.13 (-9.96; 7.70) .80   
Social support teachers Girls 0.18 (0.05; 0.31) .01 - 8.48 (-48.86; 31.91) .69 - 1.53 (8.90; 5.83) .68 - 2.10 (-8.03; 3.83) .49
  Boys 0.06 (-0.11; 0.22) .50 9.90 (-40.89; 60.69) .70 0.56 (-2.72; 3.85) .74   
Environmental opportunities Girls 0.10 (-0.08; 0.28) .25 31.41 (3.76; 59.06) .03 3.23 (-2.91; 9.37) .74 3.84 (-1.96; 9.65) .19
  Boys 0.17 (-0.10; 0.43) .21 -3.72 (-35.63; 28.19) .82 - 0.62 (-5.97; 4.73) .82   
  1. Mcpm = mean count per minute.
  2. Significant results in bold.