Sammendrag
Background: To improve effectiveness of future screen behaviour interventions, one needs to know whether an
intervention works via the proposed mediating mechanisms and whether the intervention is equally effective
among subgroups. Parental regulation is identified as a consistent correlate of screen behaviours, but prospective
evidence as well as the mediation role of parental regulation is largely lacking. This study investigated postintervention
main effects on screen behaviours in the HEIA-intervention – a Norwegian school-based multiplebehaviour
study, as well as mediation effects of parental regulation by adolescents’ and parents’ report. In addition,
moderating effects of gender and weight status on the intervention and mediating effects were explored.
Methods: Participating schools were randomized to control (n = 25) or intervention (n = 12) condition. Adolescents
(n = 908 Control; 510 Intervention) self-reported their weekday and weekend TV-viewing and computer/game-use.
Change in adolescents’ behaviours was targeted through school and parents. Adolescents, mothers (n = 591
Control; 244 Interventions) and fathers (n = 469 Control; 199 Intervention) reported parental regulation of the screen
behaviours post-intervention (at 20 month). The product-of-coefficient test using linear regression analysis was
conducted to examine main and mediating effects.
Results: There was no intervention effect on the screen behaviours in the total sample. Gender moderated effect
on weekend computer/game-use, while weight status moderated the effect on weekday TV-viewing and
computer/game-use. Stratified analyses showed a small favourable intervention effect on weekday TV-viewing
among the normal weight. Parental regulation did not mediate change in the screen behaviours. However, stronger
parental regulation was associated with less TV-viewing and computer/game-use with effects being conditional on
adolescents’ versus parental reports. Parental regulation of the screen behaviours, primarily by the parental report,
was associated with change in the respective behaviours.
Conclusion: Multiple behaviour intervention may not affect all equally well, and the effect may differ by weight
status and gender. In future interventions parents should be encouraged to regulate their adolescents’ TV-viewing
and computer/game-use on both weekdays and weekends as parental regulation was identified as a determinant
of these screen behaviours. However, future intervention studies may need to search for more effective intervention
strategies targeting parental regulation.
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