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Table 1 Description of the assessed variables at baseline by type of secondary school

From: Cross-sectional and longitudinal associations of screen time and physical activity with school performance at different types of secondary school

  Total Highest secondary school Lower secondary schools Possible range
  (n = 850) (n = 574) (n = 276)  
  M (SD) M (SD) M (SD)  
Consumption of screen-based media (hours/day)
 TV/video 1.66 (1.29) 1.27 (1.13) 2.08 (1.49) 0-5
 Game console 0.71 (1.14) 0.54 (.91) 1.05 (1.46) 0-5
 PC/internet 1.50 (1.41) 1.44 (1.34) 1.64 (1.54) 0-5
 Mobile phone 1.42 (1.65) 1.33 (1.60) 1.61 (1.75) 0-5
 Total screen time 5.31 (3.66) 4.79 (3.29) 6.38 (4.15) 0-20
Physical activity (training sessions/week)
 PA organized 1.76 (1.73) 1.91 (1.74) 1.43 (1.67) 0-6
 PA non-organized 2.17 (2.02) 2.18 (1.99) 2.15 (2.08) 0-6
 Total physical activity 3.93 (2.83) 4.10 (2.81) 3.58 (2.88) 0-12
School grades
 Mathematics 2.64 (0.85) 2.53 (0.85) 2.89 (0.80) 1-4
 German 2.34 (0.76) 2.20 (0.74) 2.61 (0.72) 1-4
 Physical Education 2.16 (0.86) 1.98 (0.78) 2.53 (0.90) 1-4
  1. Better school achievement is represented by lower school grades (following the German grading system). PA physical activity