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Table 1 Characteristics of the study population, N = 1348

From: Accelerometer data reduction in adolescents: effects on sample retention and bias

  Girls Boys
Sex, % (n = 1348) 48.4 51.6
Age, mean y (SD) (n = 1348) 12.4 (0.62) 12.5 (0.63)
BMI, mean kg/m2 (SD) (n = 1266) 18.9 (3.04) 18.8 (2.99)
Weight status (BMI thresholds)* (n = 1266)   
Under-/normal weight 85.5 85.5
Overweight/obese 14.6 14.5
Self-reported PA in leisure time % (n = 1313)** 638 (48.6) 675 (51.4)
Performs sports several times a week. Hard exercise 37.2 53.3
Doing sport approx. once a week, and besides that physical active every day, cycling, walking, playing 35.3 19.4
Enjoy being physical active, but do not attend any sport clubs. Cycle, walk and are physical active when playing 24.1 19.1
Prefer to watch TV, play video games, listening to music or other sedentary behaviour 3.5 8.2
Self-reported sedentary leisure time (n = 1313)**   
4 + hours daily sedentary time (watching TV, playing computer games, reading etc.) in leisure time in weekdays and weekend days, % 58.2 67.2
  1. *Age and sex standardized [27, 28].
  2. **Significant differences between girls and boys (p < 0.05).
  3. N varies due to different data sources.