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Table 2 Associations from cross-sectional analysesa

From: Cross-sectional and prospective associations between sleep, screen time, active school travel, sports/exercise participation and physical activity in children and adolescents

  9-y-olds 15-y-olds
MVPA (b (95% CI)) p n MVPA (b (95% CI)) p n
Sleep 0.3 (−1.5, 2.2) 0.740 2053 1.3 (− 1.0, 3.6) 0.274 1120
Screen time −2.2 (−3.1, −1.3) < 0.001 2033 −1.7 (−2.7, −0.8) < 0.001 1162
Active transport
  ≤ 5 min/d ref.   900 ref.   619
 6–15 min/d 3.6 (0.9, 6.3) 0.009 742 3.3 (0.4, 6.2) 0.027 440
 ≥ 16 min/d 7.2 (4.0, 10.4) ♀♂ < 0.001 424 9.0 (3.8, 14.1) 0.001 137
 Girls ≤5 min/d ref.      
6–15 min/d 4.6 (1.5, 7.8) 0.004     
≥ 16 min/d 10.5 (6.8, 14.3) < 0.001     
 Boys ≤5 min/d ref.      
6–15 min/d 2.4 (−1.7, 6.6) 0.253     
≥ 16 min/d 5.0 (0.4, 9.7) 0.033     
Sports/exercise
 ≤ 2 h/week ref.   736 ref.   350
 3–7 h/week 2.2 (−0.1, 4.5) 0.062 1098 7.6 (4.3, 10.8) < 0.001 555
  ≥ 8 h/week 9.2 (4.7, 13.7) ♀♂ < 0.001 225 17.9 (14.0, 21.8) < 0.001 279
 Girls ≤2 h/week ref.      
3–7 h/week 1.1 (−2.2, 4.4) 0.508     
≥ 8 h/week 1.3 (−3.9, 6.5) 0.635     
 Boys ≤2 h/week ref.      
3–7 h/week 4.5 (0.9, 8.2) 0.014     
≥ 8 h/week 14.7 (8.2, 21.3) < 0.001     
  1. aAdjusted for accelerometer wear time, sex, BMI, SES and daylightMVPA, moderate-to-vigorous physical activity
  2. b (95% CI), beta coefficient (95% confidence interval); min/d, minutes per day; hrs/week, hours per week; ♀♂, association modified by sex (p ≤ 0.036); ref., reference group