Table 1 Descriptives for the calibration and cross-validation samples stratified by age group
Age group | Younger | Older | Combined | |
|---|---|---|---|---|
Calibration sample | n = 71 | n = 32 | n = 103 | |
M ± SD | M ± SD | M ± SD | p | |
Age (y) | 9.7 ± 1.1 | 13.3 ± 1.3 | 10.8 ± 2.0 | <.001 |
Gender (% male)1 | 47.9 | 46.9 | 47.6 | .920 |
Height (cm) | 141.0 ± 7.9 | 160.5 ± 11.7 | 146.8 ± 12.7 | <.001 |
Weight (kg) | 37.4 ± 9.8 | 60.7 ± 19.3 | 44.6 ± 17.2 | <.001 |
BMI (kg/m2) | 18.6 ± 3.8 | 23.2 ± 5.6 | 20.1 ± 4.9 | <.001 |
Obese (%)1 | 12.7 | 28.1 | 17.4 | .056 |
Spring (%)1 | 57.8 | 56.2 | 57.3 | .800 |
MVPAmin (min) | 60.7 ± 23.1 | 37.6 ± 20.1 | 53.5 ± 24.6 | <.001 |
MVPA weekday (%) | 8.0 ± 3.3 | 5.0 ± 2.5 | 7.1 ± 3.3 | <.001 |
MVPA weekend (%) | 8.0 ± 4.2 | 4.9 ± 5.3 | 7.0 ± 4.8 | <.001 |
AA (cpm/day) | 475.4 ± 114.7 | 429.8 ± 137.9 | 461.2 ± 123.5 | .080 |
AM wear time (d) | 6.0 ± 0.9 | 5.6 ± 0.9 | 5.9 ± 0.9 | .025 |
PAQ (0–5 scale) | 3.2 ± 0.7 | 2.8 ± 0.6 | 3.1 ± 0.7* | .005 |
Cross-validation sample | n = 32 | n = 13 | n = 45 | |
M ± SD | M ± SD | M ± SD | p | |
Age (y) | 8.4 ± 3.1 | 13.1 ± 1.0 | 10.6 ± 1.9 | <.001 |
Gender (% male)1 | 62.5 | 53.9 | 60 | .590 |
Height (cm) | 140.7 ± 8.4 | 157.0 ± 10.9 | 145.3 ± 11.7 | <.001 |
Weight (kg) | 37.3 ± 9.4 | 46.9 ± 11.0 | 40.1 ± 10.7 | .001 |
BMI (kg/m2) | 18.7 ± 3.6 | 18.9 ± 2.8 | 18.8 ± 3.3 | .890 |
Obese (%)1 | 0 | 0 | 0 | na |
Spring (%)1 | 46.9 | 61.5 | 51.1 | .370 |
MVPAmin (min) | 61.4 ± 21.7 | 39.0 ± 19.4 | 55.7 ± 22.2 | <.001 |
MVPA week day (%) | 8.4 ± 3.1 | 5.5 ± 2.6 | 7.6 ± 3.2 | .005 |
MVPA weekend day (%) | 8.4 ± 4.7 | 4.0 ± 3.0 | 7.1 ± 4.7 | .003 |
AA (cpm/day) | 491.0 ± 100.5 | 434.6 ± 125.1 | 474.7 ± 109.8 | .120 |
AM wear time (d) | 6.2 ± 0.8 | 5.5 ± 1.1 | 6.0 ± 0.9 | .014 |
PAQ (0–5 scale) | 3.5 ± 0.5 | 2.9 ± 0.5 | 3.3 ± 0.6 | <.001 |