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Table 3 Physical activity, sedentary behaviour, sleep duration and cardio-respiratory fitness at weekdays and weekend days at three seasons in 8–11 year old Danish children

From: Seasonal variation in objectively measured physical activity, sedentary time, cardio-respiratory fitness and sleep duration among 8–11 year-old Danish children: a repeated-measures study

Variables n   Autumn     Winter     Spring  
   Weekday Weekend Ratio5 Weekday Weekend Ratio5 Weekday Weekend Ratio5
Sedentary time (min/d) 635 467 ± 66 488 ± 88** 1.05 477 ± 61 509 ± 82** 1.07 459 ± 67 481 ± 94** 1.06
Screen-time (min/d)1 704 120 (80;165) 210 (135;300)**        
Screen-time (≤2 h/d)1,2 704 46% 17%**        
Total PA (cpm) 635 507 (417;614) 400 (295;514)** 0.84a 464 (388;566) 347 (259;441)** 0.78b 555 (450;671) 460 (331;635)** 0.92c **
MVPA (min/d) 635 50 (34;71) 28 (16;47)** 0.68a 46 (32;66) 24 (12;39)** 0.63a 56 (38;78) 40 (21;62)** 0.83b **
MVPA (≥1 h/d)3 635 37% 15%** 0.41 33% 9%** 0.28 45% 27%** 0.60 *
Sleep duration (min/night)4 523 559 ± 28 549 ± 48** 0.99 554 ± 31 549 ± 48* 1.00 543 ± 32 536 ± 55* 0.99
  1. Abbreviations: PA Physical activity, MVPA Moderate-to-vigorous physical activity.
  2. Data are presented as mean ± standard deviation or median (interquartile range) tested by student t-test or one-way ANOVA with post-hoc Bonferroni test (non-normal distributed data were transformed before analysis) or proportions (%) tested by Chi-square test. *, P < 0.05; **, P < 0.001. Different superscripts in a row (a,b,c) indicate significant difference (P ≤0.05).
  3. 1Only measured at baseline.
  4. 2Screen time recommendations [23].
  5. 3Physical activity recommendations [17].
  6. 4Boys were sleeping 12, 11 and 13 min/night less during weekend days compared to weekdays in autumn, winter and spring (P < 0.001). Girls were not sleeping less during weekend days compared to weekdays (3, -4 and 0 min/night in autumn, winter and spring (P ≥ 0.22).
  7. 5Weekend day/weekday-ratio within season.