Table 1 Descriptive characteristics of study participants and descriptive accelerometer and motor competence variables (mean (SD) unless indicated otherwise)
Variables | All schools | Primary schools (all) | Secondary schools (all) | All schools (girls) | Primary schools (girls) | Secondary schools (girls) | All schools (boys) | Primary schools (boys) | Secondary schools (boys) |
|---|---|---|---|---|---|---|---|---|---|
n | 359 | 210 | 149 | 182 | 103 | 79 | 177 | 107 | 70 |
Age (years) | 11.5 (1.4) | 10.4 (0.7) | 13.0 (0.3) | 11.5 (1.5) | 10.3 (0.7) | 13.1 (0.3) | 11.5 (1.3) | 10.5 (0.7) | 13.0 (0.3) |
Girls (%) | 50.7 | 49.0 | 53.0 | – | – | – | – | – | – |
Ethnicity | |||||||||
 White British (%) | 96.9 | 97.1 | 96.6 | 98.9 | 99.0 | 98.7 | 94.9 | 95.3 | 94.3 |
Socioeconomic status | |||||||||
 IMD score | 13.0 (8.9) | 11.3 (6.5) | 15.4 (11.0) | 13.3 (9.9) | 11.6 (7.1) | 15.4 (12.4) | 12.7 (7.7) | 11.0 (5.8) | 15.3 (9.3) |
 IMD decile | 7.3 (2.3) | 7.8 (2.0) | 6.7 (2.5) | 7.4 (2.4) | 7.7 (2.1) | 6.8 (2.6) | 7.3 (2.2) | 7.8 (1.9) | 6.5 (2.3) |
 Height (cm) | 149.1 (11.3) | 143.0 (8.3) | 157.8 (9.1) | 149.0 (11.7) | 142.4 (8.6) | 157.6 (9.6) | 149.3 (10.9) | 143.6 (8.0) | 158.1 (8.6) |
 Body mass (kg) | 43.1 (12.2) | 37.9 (9.7) | 50.4 (11.6) | 43.6 (12.9) | 38.0 (10.4) | 51.0 (12.2) | 42.5 (11.5) | 37.8 (9.2) | 49.7 (10.9) |
 BMI (kg m−2) | 19.1 (3.6) | 18.3 (3.2) | 20.1 (3.8) | 19.4 (3.9) | 18.5 (3.4) | 20.5 (4.1) | 18.8 (3.3) | 18.1 (3.0) | 19.7 (3.4) |
 BMI z-score | 0.39 (1.21) | 0.38 (1.23) | 0.41 (1.17) | 0.35 (1.23) | 0.35 (1.24) | 0.35 (1.23) | 0.44 (1.18) | 0.42 (1.22) | 0.47 (1.12) |
Weight status | |||||||||
 Underweight (%) | 7.9 | 8.2 | 7.5 | 8.3 | 8.7 | 7.7 | 7.3 | 7.5 | 7.1 |
 ‘Normal’ weight (%) | 67.6 | 66.7 | 68.9 | 66.9 | 64.1 | 70.5 | 68.4 | 69.2 | 67.1 |
 Overweight (%) | 19.8 | 20.5 | 18.9 | 18.2 | 20.4 | 15.4 | 21.5 | 20.6 | 22.9 |
 Obese (%) | 4.7 | 4.8 | 4.7 | 6.6 | 6.8 | 6.4 | 2.8 | 2.8 | 2.9 |
Accelerometera | |||||||||
 ST (min·day−1) | 635.8 | 580.6 | 693.6 | 639.6 | 592.8 | 701.0 | 632.7 | 598.9 | 684.8 |
 LPA (min·day−1) | 210.1 | 211.2 | 205.6 | 210.8 | 212.8 | 206.8 | 208.4 | 210.5 | 204.1 |
 MVPA (min·day−1) | 50.9 | 60.1 | 41.6 | 44.9 | 52.6 | 36.3 | 57.0 | 63.3 | 48.4 |
 Meet PA guidelineb (%) | 23.1 | 30.0 | 13.4 | 15.9 | 21.4 | 8.9 | 30.5 | 38.3 | 18.6 |
 Sleep (min·day−1) | 543.2 | 588.1 | 499.3 | 544.6 | 581.7 | 495.9 | 541.9 | 567.3 | 502.8 |
 Meet sleep guidelinec (%) | 27.6 | 41.4 | 8.1 | 32.4 | 51.5 | 7.6 | 22.6 | 31.8 | 8.6 |
 Valid wear time (hour·day−1) | 22.8 (1.0) | 22.4 (0.8) | 23.4 (0.9) | 22.9 (1.0) | 22.4 (0.8) | 23.5 (0.8) | 22.7 (1.0) | 22.3 (0.8) | 23.3 (0.9) |
 Number of days with valid wear time | 5.9 (1.6) | 6.1 (1.0) | 5.6 (2.1) | 6.1 (1.4) | 6.2 (1.0) | 6.0 (1.7) | 5.6 (1.8) | 6.0 (1.1) | 5.1 (2.4) |
Dragon Challenge scores | |||||||||
 Overall score | 32.0 (7.4) | 31.2 (7.4) | 33.2 (7.4) | 30.8 (7.2) | 30.1 (6.7) | 31.8 (7.7) | 33.3 (7.5) | 32.3 (7.9) | 34.8 (6.7) |
 Process score | 9.4 (3.2) | 9.0 (3.1) | 9.9 (3.2) | 8.8 (3.2) | 8.4 (2.9) | 9.3 (3.5) | 9.9 (3.1) | 9.5 (3.2) | 10.5 (2.9) |
 Product score | 10.2 (3.5) | 10.0 (3.5) | 10.4 (3.6) | 9.8 (3.6) | 9.7 (3.4) | 10.0 (3.8) | 10.6 (3.5) | 10.3 (3.6) | 10.9 (3.3) |
 Time score | 12.5 (2.1) | 12.2 (2.2) | 12.9 (1.8) | 12.2 (1.8) | 12.0 (1.8) | 12.5 (1.8) | 12.8 (2.2) | 12.5 (2.5) | 13.3 (1.8) |