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Table 2 Crude and adjusted proportion (%) of children reporting a screen time activity of 2 hours/day or more according to sex, class, and parental education stratified by the year the study was performed*

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

  CRUDE ADJUSTED*
  2001 2008 Change (percentage points) p 2001 2008 Change (percentage points) P for time x group interaction
% (95% CI) % (95% CI) % (95% CI) % (95% CI)
(n=1461) (n=1317) (n=1209) (n=979)
All 55 (53, 58) 45 (43, 48) −10 0.000 55 (52, 59) 45 (42, 49) −10  
Sex             0.661
Boys 61 (58, 65) 51 (47, 55) −11 0.000 60 (55, 64) 51 (46, 55) −9  
Girls 49 (46, 53) 41 (37, 44) −9 0.001 51 (47, 55) 40 (35, 44) −11  
Grade level             0.022
6 51 (48, 55) 38 (34, 41) −13 0.000 51 (47, 56) 37 (32, 41) −15  
7 60 (56, 63) 54 (50, 58) −6 0.023 59 (55, 64) 54 (49, 59) −5  
Parental education level             0.044
Low 57 (53, 60) 51 (47, 56) −5 0.079 57 (53, 61) 51 (46, 56) −6  
High 53 (49, 58) 39 (34, 43) −15 0.000 54 (49, 58) 39 (35, 44) −14  
  1. *Multilevel linear mixed models adjusted for all variables presented in the table and school as a random effect.