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

BMC Public Health

Yngvar Ommundsen⁴  Sigmund A Anderssen³  Knut-Inge Klepp²  Nanna Lien²  May Grydeland³  Mona Bjelland²  Maartje M van Stralen¹  Ingunn H Bergh⁴ 

[1] Department of Health Sciences and the EMGO Institute for Health and Care Research, Faculty of Earth and Life Sciences, VU University Amsterdam, de Boelelaan 1085, 1081, HV Amsterdam, the Netherlands;Department of Nutrition, Faculty of Medicine, University of Oslo, Oslo NO-0316, Norway;Department of Sport Medicine, Norwegian School of Sport Sciences, PB 4014 Ullevaal Stadion, Oslo NO-0886, Norway;Department of Coaching and Psychology, Norwegian School of Sport Sciences, PB 4014 Ullevaal Stadion, Oslo NO-0886, Norway

关键词: Adolescents;    Moderation;    Mediation;    Intervention;    Obesity prevention;    Sedentary behaviour;   

Others  :  1132467
DOI  :  10.1186/1471-2458-14-200

 received in 2014-02-04, accepted in 2014-02-13,  发布年份 2014

【 摘 要 】

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 post-intervention main effects on screen behaviours in the HEIA-intervention – a Norwegian school-based multiple-behaviour 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.

Trial registration

Current Controlled Trials ISRCTN98552879

【 授权许可】

   
2014 Bergh et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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