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Table 2 Descriptives for screen behaviours, main intervention effects in all and by weight status and gender

From: Post-intervention effects on screen behaviours and mediating effect of parental regulation: the HEalth In Adolescents study – a multi-component school-based randomized controlled trial

  Baselinea Post-intervention   
  Control (n = 908) Intervention (n = 510) Control (n = 908) Intervention (n = 510) Main intervention effect p
  Mean (SD) Mean (SD) Mean (SD) Mean (SD) c-coeff (95% CI)  
Weekday TV-viewing b,d       
All 1.45 (0.99) 1.47 (1.08) 1.70 (1.06) 1.63 (1.15) -0.08 (-0.19, 0.04) .18
Normal weight 1.39 (0.93) 1.48 (1.08) 1.66 (1.03) 1.58 (1.10) -0.12 (-0.24, -0.01) .04
Overweight 1.82 (1.21) 1.64 (1.15) 1.90 (1.16) 2.07 (1.39) 0.22 (-0.17, 0.62) .26
Weekend TV-viewing e       
All 2.15 (1.19) 2.25 (1.29) 2.47 (1.23) 2.40 (1.27) -0.12 (-0.25, 0.01) .07
Weekday comp/game-use b,f       
All 1.13 (0.92) 1.07 (0.92) 1.37 (1.04) 1.32 (1.02) -0.01 (-0.12, 0.11) .93
Normal weight 1.09 (0.89) 1.05 (0.87) 1.36 (1.03) 1.28 (0.99) -0.04 (-0.16, 0.08) .49
Overweight 1.38 (1.02) 1.31 (1.16) 2.00 (1.21) 1.71 (1.20) 0.27 (-.0.10, 0.62) .15
Weekend comp/game-use b,g       
All 1.51 (1.10) 1.53 (1.12) 1.82 (1.17) 1.78 (1.20) -0.06 (-0.18, 0.06) .36
Girls 1.24 (1.00) 1.20 (0.95) 1.68 (1.12) 1.51 (1.09) -0.15 (-0.32, 0.03) .09
Boys 1.75 (1.14) 1.84 (1.19) 1.94 (1.19) 2.05 (1.24) 0.02 (-0.16, 0.20) .83
  1. c-coeff: c-coefficient; Comp/game: computer/game-use; SD: standard deviation.
  2. TV-viewing and comp/game-use reported as hours/day.
  3. aBaseline differences for screen behaviours were tested with independent t-test; no significant differences were found.
  4. bSubgroup analyses based on preceding significant interaction analyses by gender or weight status.
  5. Effect analyses for the whole sample for TV-viewing were adjusted for weight status and parental education level.
  6. Effect analyses for the whole sample for computer/game-use were adjusted for gender, weight status and parental education level.
  7. n varies for the different behaviours:
  8. dn in analyses for Weekday TV-viewing: All = 1299; normal weight =1130; overweight = 169.
  9. en in analyses for Weekend TV-viewing: All = 1281.
  10. fn in analyses for Weekday comp/game-use: All = 1286; normal weight = 1119; overweight = 167.
  11. gn in analyses for Weekend comp/game-use: All = 1272; girls = 618; boys = 654.