Table 2.
Physical activity, sedentary behaviour, sleep duration and cardio-respiratory fitness according to season of measurement in 8–11 year old Danish children
| 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 ** |
Abbreviations:ICC Intraclass correlation coefficient, MAPE Mean absolute percentage error, PA Physical activity, MVPA Moderate-to-vigorous physical activity, CRF Cardio-respiratory fitness.
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.
*, P < 0.05; **, P < 0.001. Different superscripts in a row (a,b,c) indicate significant differences (P <0.05).
1Only measured at baseline.
2Screen time recommendations [23].
3Physical activity recommendations [17].
4Distance run in the CRF-test at autumn, winter and spring were 973, 996 and 1023 meters, respectively.