Table 1.
Descriptive characteristics of the participants, weight and physical activity status
| Girls (N = 209) |
Boys (N = 156) |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | 95% CI | Mean | SD | 95% CI | |||||
| Age and anthropometrics | ||||||||||
| Age, years | 9.8 | 1.3 | 9.6 | to | 10.0 | 9.9 | 1.2 | 9.7 | to | 10.0 |
| Body height, cm | 142.5 | 8.9 | 141.3 | to | 143.7 | 143.8 | 9.4 | 142.3 | to | 145.2 |
| Body weight, kg | 35.8 | 8.8 | 34.6 | to | 37.0 | 37.4 | 9.2 | 36.0 | to | 38.9 |
| BMI, kg · m−2 | 17.4 | 2.8 | 17.0 | to | 17.8 | 17.9 | 2.8 | 17.4 | to | 18.3 |
| Weight status, N (% of N)a | ||||||||||
| Underweight | 9 (4) | 8 (5) | ||||||||
| Normal weight | 152 (73) | 113 (73) | ||||||||
| Overweight | 26 (12) | 25 (16) | ||||||||
| Obesity | 22 (11) | 10 (6) | ||||||||
| Physical activity | ||||||||||
| Sedentary time, min · d−1 | 394.4 | 51.7* | 387.4 | to | 401.5 | 379.3 | 48.5 | 371.6 | to | 386.9 |
| Light physical activity, min · d–1b | 106.8 | 27.3* | 103.1 | to | 110.5 | 117.0 | 36.2 | 111.2 | to | 122.7 |
| MVPA, min · d–1b | 37.4 | 16.7* | 35.1 | to | 39.6 | 46.7 | 21.3 | 43.4 | to | 50.1 |
| Vigorous physical activity, min · d–1b | 5.3 | 6.6 | 4.4 | to | 6.2 | 5.2 | 5.9 | 4.3 | to | 6.2 |
| Steps per day | 10 465 | 2 394* | 10 138 | to | 10 791 | 11 176 | 2 949 | 10 709 | to | 11 642 |
| Physical activity status | ||||||||||
| Achieve ≥60 min · d−1of MVPA, N (% of N) | 17 (8) | 34 (22) | ||||||||
| Number of days with wear time ≥10 hc | 6 (1) | 6 (1) | ||||||||
| Wear time, h · d−1 | 12.8 | 0.9 | 12.7 | to | 12.9 | 13.0 | 0.9 | 12.9 | to | 13.2 |
N number of participants, SD standard deviation, CI confidence interval, BMI body mass index, MVPA moderate-to-vigorous physical activity
*Significantly different from boys, independent samples t-test, P < 0.05
aCategories were defined by sex- and age-specific cut-off points for BMI
bValues were transformed to natural logarithms before analysis
cExpressed as the median and interquartile range