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Table 1 Description of participants included in 2001 and 2008

From: Changes in screen time activity in Norwegian children from 2001 to 2008: two cross sectional studies

  2001 2008 p-value*
Number of schools 27 27  
Eligible pupils 1727 1712  
Participating pupils 1488 1339  
Participation rate pupils (%) 86% 78%  
Sex pupils (% girls) 50% 52% 0.21
Age pupils (% 7th graders) 47% 49% 0.50
TV/PC watching (% ≥2 hours/day) 55% 45% <0.001
Mean time spent on TV/PC watching (hours/day) (mean (SD)) 2.1 (1.5) 1.7 (1.4) <0.001
Time spent on screen time, pupils (%):    
Spend no time on screen time activity 19 (1) 19 (1)  
Less than ½ hour/day 150 (10) 155 (12)  
½-1 hour/day 484 (33) 544 (41)  
2-3 hours/day 515 (35) 429 (33)  
4 hours/day 133 (9) 80 (6)  
More than 4 hours/day 160 (11) 90 (7) <0.001
Participating parents 1230 996  
Participation rate parents (%) 83% 74%  
Sex parents (% women) 85% 78% <0.001
Age parents (mean, years) 39.9 41.1 <0.001
Education, parents (% with higher education) 42% 54% <0.001
  1. *P values are based on t-tests for continuous variables and on chi-square tests for dichotomous variables.