Harrison, Michael

Lane, Aoife

Murphy, N. M.

WIT Repository

Correlates and Implications of High Screen Time among High and Low Active Irish Nine-Year Olds   Aoife Lane, Niamh Murphy, Michael Harrison   Centre for Health Behaviour Research, Waterford Institute of Technology, Ireland  Does screen time(ST) predict overweight/obesity(OW/obesity) independently of physical activity(PA) in 9 year old children?   27% of Irish children OW/obese  Research Questions • RQ1 What is the combined influence of ST and PA on risk of OW/obesity in a large nationally representative cohort of 9 year old Irish school children? • RQ2 Even in sufficiently active children, is high ST a risk factor for OW/obesity ? • RQ3 What are the correlates of high ST? Method • Growing Up in Ireland Study: longitudinal study to describe lives of Irish children (infant and child cohort) • Total N = 8568 nine-year olds (49% boys) and their parents • Randomly selected to ensure geographical representation; 57% response • Parental report of child PA (participation in hard exercise over a two week period-Leisure Time Exercise Questionnaire), TV time, presence of electronic equipment in the child’s room, sport club membership, mobile phone ownership, activities with parents  • Social class, gender • Objectively measured BMI  Method – Analysis Description High PA >9 bouts of hard exercise over 2 weeks Low PA 0-8 bouts of hard exercise over 2 weeks High ST >3 hours of screen time per day Low ST <3 hours of screen time per day OW/Obese BMI ≥ 19.1 boys BMI ≥ 19.07 girls Normal/Underweight BMI <19.1 boys BMI < 19.07 girls Chi squared statistics and forced entry logistic regression was used to identify factors associated with OW/obesity and with ST . Data presented as adjusted odds ratios. Combined Categories To assess the combined influence of  PA and ST on OW/obesity, children were categorised into one of four ST/PA groups  High PA/Low ST: 51.2%  High PA/High ST: 3.8%  Low PA/Low ST: 39.7% Low PA/High ST: 5.4% Predictors of OW/Obesity Overall Sample Adjusted OR  (95% CI) n=7035 High PA Adjusted OR (95% CI) n=3860 Low PA Adjusted OR  (95% CI) n=3175 Gender Boys Girls 1 1.41 (1.25-1.60)^ 1 1.30 (1.09-1.55)^ 1 1.51 (1.27-1.80)^ Social Class SC 1-2 SC 3-4 SC 5-6 1 1.18 (1.04-1.34)^ 1.33 (1.089-1.62)^ 1 1.24 (1.03-1.48)^ 1.26 (.94-1.68) 1 1.11 (.93-1.33) 1.39 (1.05-1.85)^ Hard Exercise 9+ times None/1-2 times 1 1.38 (1.11-1.73)^  Screen Time None/less than 1 hr 1-3 hrs >3 hrs 1 1.18 (1.04-1.38)^ 1.78 (1.43-2.22)^ 1 1.16 (.96-1.41) 1.78 (1.29-2.47)^ 1 1.21 (.99-1.50) 1.77 (1.31-2.39)^ TV in Bedroom No Yes 1 1.38 (1.19-1.59)^ 1 1.32 (1.07-1.61)^ 1 1.45 (1.19-1.77)^ Mobile Phone No Yes 1 1.41 (1.24-1.59)^ 1 1.56 (1.31-1.86)^ 1 1.26 (1.06-1.50)^ Combined Categories Low ST/High PA Low ST/Low PA High ST/High PA High ST/Low PA 1 1.38 (1.22-1.56)^ 1.63 (1.23-2.18)^ 2.07 (1.62-2.66)^ Results (and take home messages!)  • RQ1 Combined influence of ST and PA on risk of OW/obesity? Compared to the reference group of low ST/high PA, children who reported low ST and low PA had a 38% increased risk (p<.05) of OW/obesity while children who maintained high PA but high ST had a 63% increased risk (p<.05).   • Children in the high ST/low PA category were twice as likely to be OW/obese (OR=2.07) than the reference group.  • Reinforces findings in  older children : sedentarism is a predictor of weight gain independent of PA status. This justifies efforts to reduce sedentary behaviour as part of existing public health initiatives.    • RQ2 Is high ST a risk factor for OW/obesity even in sufficiently active children? Even in high active 9 year old children, ST a predictor of OW/obesity (>3 hours ST, OR 1.78; 1-3 hours, OR 1.16).   • RQ3: Correlates of high ST? Regardless of PA status, technology in bedroom and having a mobile phone associated with higher screen time.   The message for parents of 9 year olds? Learn to say ‘No’! 31/8/11 A NEW SURVEY of Irish parents  has shown that over a third  of children aged 8  now owns a mobile phone –  

Correlates and Implications of High Screen Time among High and Low Active Irish Nine-Year Olds

Waterford Institute of Technology Repository

http://repository.wit.ie/2720/1/short%20presentation%20nm%20edits%20Be%20Active%202012.pdf

Correlates and Implications of High Screen Time among High and Low Active Irish Nine-Year Olds

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