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Table 2 Baseline data descriptive statistics

From: Effect and cost of an after-school dance programme on the physical activity of 11–12 year old girls: The Bristol Girls Dance Project, a school-based cluster randomised controlled trial

  Control Intervention
Variable N Mean SD or IQR N Mean SD or IQR
Mean height (cm) 287 149.44 7.42 284 149.27 7.04  
Median weight (kg)c 287 41.90 35.90 to 49.30 284 41.50 37.15 to 49.05
BMI (kg/m2) 287 19.53 3.70 284 19.48 3.44
BMI SDSd 285 0.38 1.21 279 0.40 1.16
  N Median 25 IQR 75 IQR N Median 25 IQR 75 IQR
IMD score summary statistic 287 17.99 9.81 35.35 282 15.68 9.29 23.91
Accelerometer provision Na Nb %   Na Nb %  
Proportion with valid weekday data (≥2 valid weekdays)e 286 276 96.50   282 273 96.81  
Proportion with valid weekend day data (≥1 valid weekend days) 286 221 77.27   282 210 74.47  
Weekday accelerometer data N Median 25 IQR 75 IQR N Median 25 IQR 75 IQR
Total valid weekday mins 280 3519.17 2715.08 4027.58 280 3267.00 2571.50 3972.08
Average valid weekday mins 280 787.46 725.35 832.69 280 779.36 724.32 829.31
Total valid weekday CPM 280 431.78 352.53 523.02 280 476.30 396.17 555.07
Average weekday MVPA mins 280 49.15 37.38 60.65 280 53.25 41.50 68.03
Average weekday light PA mins 280 193.27 166.71 219.80 280 196.57 171.62 225.75
Average weekday sedentary mins 280 528.35 474.25 581.08 280 520.26 463.47 568.38
Weekend accelerometer data N Median 25 IQR 75 IQR N Median 25 IQR 75 IQR
Total valid weekend day mins 221 1238.50 655.00 1440.00 210 1215.33 660.50 1389.00
Average valid weekend day mins 221 694.75 618.17 759.17 210 675.96 609.75 736.08
Total valid weekend day CPM 221 378.64 296.24 533.03 210 416.18 324.03 558.45
Average weekend day MVPA mins 221 32.50 22.17 48.33 210 35.38 24.58 54.33
Average weekend day light PA mins 221 181.50 154.42 214.08 210 192.83 155.08 223.75
Average weekend day sedentary mins 221 476.58 398.00 529.42 210 437.25 384.83 492.50
Psychosocial variables N Mean SD N Mean SD
Autonomous motivation dance 287 3.91 0.58 284 3.91 0.65
Autonomous motivation PA 287 4.01 0.63 284 3.96 0.74
Controlled motivation dance 287 1.95 0.72 284 1.94 0.63
Controlled motivation PA 287 2.25 0.76 284 2.17 0.74
Autonomy need satisfaction 287 5.67 1.00 284 5.62 1.05
Competence need satisfaction 287 5.24 1.19 284 5.17 1.23
Relatedness need satisfaction 287 5.89 1.26 284 5.89 1.31
Self esteem 287 4.96 0.81 284 4.97 0.77
  1. Na – N of participants with any valid accelerometer data
  2. Nb – N of participants meeting inclusion criteria
  3. cMedian & IQR reported for weight as it is non normal
  4. dAge adjusted BMI score. Missing data due to no date of birth being reported
  5. ePercentage of girls who had ≥2 valid week days of accelerometer data at T0.
  6. PA - Physical Activity
  7. MVPA – Moderate-to-vigorous intensity physical activity
  8. CPM - Counts per minute