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Table 3 Baseline characteristics of completers versus non-completers at 14 month follow-up

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

Characteristics Completers (n = 1361) Non-completers (n = 301) P-valuea
Age, years (SD) 12.8 (0.8) 13.1 (0.8) < 0.001
Year group categories, n (%)
 Year 7 571 (41.9) 73 (24.2)  
 Year 8 544 (39.9) 147 (48.8)  
 Year 9 247 (18.1) 81 (26.9) < 0.001
Ethnicity categories, n (%)
 White European 1014 (74.6) 244 (81.1)  
 South Asian 175 (12.9) 28 (9.3)  
 Other 170 (12.5) 29 (9.6) 0.060
 IMD decile, score (SD)b 5.8 (2.8) 5.8 (3.0) 0.678
Biometric measurements
 Average standing height, cm (SD) 155.6 (7.9) 157.8 (7.0) < 0.001
 Average sitting height, cm (SD) 81.1 (4.6) 82.2 (4.1) < 0.001
 Body mass, kg (SD) 48.1 (12.2) 51.3 (12.7) < 0.001
 BMI, z-score (SD) 0.13 (1.3) 0.33 (1.3) 0.021
 APHV, years (SD) 12.1 (0.5) 12.1 (0.5) 0.600
Accelerometer variables
 MVPA, mins/day [IRQ] 42.5 [30.2-55.6] 40.8 [30.1-60.2] 0.598
 Light PA, mins/day [IRQ] 275 [246-305] 274.9 [246-304] 0.634
 Sedentary, mins/day [IRQ] 550 [511-593] 550.7 [514-595] 0.600
Valid days, number (SD) 6.7 (0.9) 6.5 (1.2) < 0.001
Pupils achieving ≥60 mins MVPA on every valid day, n (%) 32 (2.4) 5 (2.0) 0.597
  1. 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
  2. Missing data: 2 age; 2 ethnicity; 110 pupils social deprivation score; 29 standing height; 50 sitting height; 6 body weight; 33 BMI, BMI categories; 56 percentage body fat; 72 APHV, biological maturity; 41 light PA, 43 pupils meeting PA guidelines, 41 number of valid days; 52 sedentary; 0 all other variables
  3. NOTE: Completers included all those who assented at the 14 month visit from all 18 completing schools and the one school with the modified 14 month visit. Non-completers included all those who did not provide assent at the 14 month visit from all 18 completing schools and the one school with the modified 14 month visit. Participants from one school lost to follow-up were not included in either group
  4. aP-values test for the difference between completers and non-completers and were estimated using either two sample t-test, Chi-squared test or Wilcoxon rank sum test, as appropriate
  5. bIMD 2015 decile score ranges 1–10, where 1 is the least deprived and 10 the most deprived