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Table 2 Baseline characteristics at the individual participant level by randomised group; usual practice (control) or the Girls Active programme (intervention)

From: Effectiveness of the ‘Girls Active’ school-based physical activity programme: A cluster randomised controlled trial

Individual level characteristics Control (n = 885) Intervention (n = 867) Total (n = 1752)
Age, years (SD) 12.8 (0.8) 12.8 (0.8) 12.8 (0.8)
Year group categories, n (%)
 Year 7 356 (40.2) 318 (36.7) 674 (38.5)
 Year 8 355 (40.1) 365 (42.1) 720 (41.1)
 Year 9 174 (19.7) 184 (21.2) 358 (20.4)
Ethnicity categories, n (%)
 White European 669 (75.9) 673 (77.1) 1342 (76.8)
 South Asian 123 (14.0) 81 (9.4) 204 (11.7)
 Other 90 (10.2) 112 (12.9) 202 (11.6)
IMD decile, score (SD)a 6.5 (2.8) 5.1 (2.7) 5.8 (2.8)
IMD rank, score (SD) 19,649 (9395) 15,322 (8840) 17,505.8 (9375)
Biometric Measurements
 Average standing height, cm (SD) 156.1 (7.9) 155.8 (7.8) 156.0 (7.9)
 Average sitting height, cm (SD) 81.5 (4.6) 81.1 (4.6) 81.3 (4.6)
 Body mass, kg (SD) 48.7 (12.4) 48.9 (12.4) 48.8 (12.4)
 BMI, z-score (SD) 0.14 (1.3) 0.22 (1.3) 0.18 (1.3)
 Percent body fat, % (SD) 23.9 (7.6) 24.2 (7.8) 24.1 (7.7)
 APHV, years (SD) 12.1 (0.5) 12.1 (0.5) 12.1 (0.5)
BMI categories, n (%)
 Underweight 136 (15.7) 129 (15.2) 265 (15.4)
 Normal weight 543 (62.6) 530 (62.4) 1073 (62.5)
 Overweight 154 (17.7) 149 (17.5) 303 (17.6)
 Obese 35 (4.0) 42 (4.9) 77 (4.5)
Biological maturity categories, n (%)
 Early 139 (16.4) 125 (15.0) 264 (15.7)
 Average 576 (68.0) 570 (68.5) 1146 (68.3)
 Late 132 (15.6) 137 (16.5) 269 (16.0)
Accelerometer variables
 MVPA, mins/day [IRQ] 43.9 [30.6-58.0] 41.8 [29.2-56.1] 42.6 [29.9-57.0]
 Light PA, mins/day [IRQ] 279.5 [247.8-307.0] 272.5 [244.5-302.7] 275.8 [246.1-305.0]
 Sedentary, mins/day [IRQ] 549.4 [508.5-592.1] 552.6 [516.0-594.3] 550.6 [511.7-593.5]
 Overall PA, mg (SD) 36.7 (8.9) 35.7 (8.8) 36.2 (8.9)
 Valid days, number (SD) 6.6 (1.1) 6.8 (0.9) 6.7 (1.0)
 Pupil’s achieving ≥ 60 mins MVPA on every valid day, n (%) 20 (2.3) 20 (2.4) 40 (2.3)
  1. Values are presented as means (standard deviation) or median [interquartile range] for continuous variables and number (%) for categorical variables
  2. aIMD 2015 decile score ranges 1–10, where 1 is the least deprived and 10 the most deprived
  3. IMD index of multiple deprivation; BMI body mass index; APHV age at peak height velocity; MVPA moderate- to vigorous-intensity physical activity; PA physical activity
  4. Missing data: 2 age; 4 ethnicity; 123 pupils social deprivation score; 30 standing height; 50 sitting height; 7 body weight; 34 BMI; 33 percentage body fat; 73 APHV, biological maturity; 44 MVPA, light PA; 46 pupils meeting PA guidelines, number of valid days; 58 sedentary; 0 all other variables