Table 1 Descriptive characteristics of the SPEEDY sample, stratified by sex
Overall | Boys | Girls | p-value | |
|---|---|---|---|---|
Sex n (%) | 1513 | 678 (44.8) | 835 (55.2) | |
Age, mean ± SD, y | 10.3 ± 0.3 | 10.2 ± 0.3 | 10.3 ± 0.3 | 0.29 |
BMI z-score, mean ± SD | 0.38 ± 1.14 | 0.42 ± 1.11 | 0.36 ± 1.16 | 0.34 |
Socioeconomic indicators | ||||
- Own car, % | 95.8 | 95.2 | 96.4 | 0.24 |
- Own/buying home, % | 75.3 | 75.4 | 75.3 | 0.96 |
- Mother left full-time education at >16 y, % | 53.0 | 53.0 | 53.0 | 0.78 |
- Composite SES, % | 0.97 | |||
Lowest (score: 0 or 1) | 17.4 | 17.5 | 17.3 | |
Middle (score: 2) | 38.3 | 38.0 | 38.6 | |
Highest (score: 3) | 44.3 | 44.5 | 44.1 | |
Home location, % urban | 66.1 | 63.8 | 67.8 | 0.10 |
Accelerometer-derived data (all: mean ± SD) | ||||
- Leisure-time sedentary time (min/wk) | 2091.3 ± 320.8 | 2070.4 ± 335.5 | 2108.3 ± 307.4 | 0.02 |
- Valid leisure-time registered time (min/wk) | 3364.1 ± 375.7 | 3393.5 ± 385.0 | 3340.2 ± 366.5 | 0.01 |
- Proportion of registered time spent sedentary (%) | 62.2 ± 6.5 | 61.0 ± 6.8 | 63.1 ± 6.0 | <0.001 |