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Table 2 Physical activity, sedentary behaviour, sleep duration and cardio-respiratory fitness according to season of measurement 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 ICC Bias (%) MAPE (%)
Sedentary time (min/d) 635 473 ± 63a 486 ± 59b 465 ± 66a ** 0.60 −0.4/2.5/-2.1 5.4/5.5/5.8
Screen-time (min/d)1 704 146 (102;193)      
Screen-time (≤2 h/d)1,2 704 34%      
Total PA (cpm) 635 490 ± 135a 447 ± 120b 557 ± 175c ** 0.47 −1.2/-9.9/11.1 11.6a/13.1b/15.1c **
MVPA (min/d) 635 49 ± 23a 44 ± 22b 57 ± 27c ** 0.64 −2.0/-11.1/13.1 17.9a/19.4ab/21.1b *
MVPA (≥1 h/d) (%)3 635 28% 22% 39% **    
CRF (ml/kg/min)4 492 47.5 ± 5.1a 48.3 ± 5.4ab 49.2 ± 5.8c ** 0.74 −1.6/-0.1/1.7 3.7a/3.2b/3.9a *
Sleep duration (min/night) 523 556 ± 27a 553 ± 28a 541 ± 30b ** 0.50 1.2/0.5/-1.6 2.3a/2.2a/2.7b **
  1. Abbreviations: ICC Intraclass correlation coefficient, MAPE Mean absolute percentage error, PA Physical activity, MVPA Moderate-to-vigorous physical activity, CRF Cardio-respiratory fitness.
  2. Data are presented as mean ± standard deviation or median (interquartile range) tested using one-way ANOVA with post-hoc Bonferroni test (non-normal distributed data was transformed before analysis) or proportions (%) tested using Pearson’s chi-squared test.
  3. *, P < 0.05; **, P < 0.001. Different superscripts in a row (a,b,c) indicate significant differences (P <0.05).
  4. 1Only measured at baseline.
  5. 2Screen time recommendations [23].
  6. 3Physical activity recommendations [17].
  7. 4Distance run in the CRF-test at autumn, winter and spring were 973, 996 and 1023 meters, respectively.