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Table 2 Accelerometer and questionnaire data provision rates by trial arm at baseline, Time 1 and Time 2.

From: Results of a feasibility cluster randomised controlled trial of a peer-led school-based intervention to increase the physical activity of adolescent girls (PLAN-A)

  Control, n (%) Intervention, n (%a) Total, n (% a)
Time 0
 Accelerometer returned 153 (96.84) 258 (96.27) 411 (96.48)
 Accelerometer validb 128 (81.01) 224 (83.58) 352 (82.63)
 Accelerometer invalidc 25 (15.82) 34 (12.69) 59 (13.85)
 Accelerometer missingd 5 (3.16) 10 (3.73) 15 (3.52)
 Psychosocial questionnaire 157 (99.37) 269 (100.00) 426 (99.77)
Time 1
 Accelerometer returned 135 (85.44) 255 (95.15) 390 (91.55)
 Accelerometer valid 107 (67.72) 196 (73.13) 303 (71.13)
 Accelerometer invalid 27 (17.09) 54 (20.15) 81 (19.01)
 Accelerometer missing 24 (15.19) 18 (6.71) 42 (9.86)
 Psychosocial questionnaire 144 (91.14) 257 (95.54) 401 (93.91)
Time 2
 Accelerometer returned 140 (88.61) 241 (89.93) 381 (89.44)
 Accelerometer valid 91 (57.59) 174 (64.93) 265 (62.21)
 Accelerometer invalid 44 (27.85) 66 (24.63) 110 (25.82)
 Accelerometer missing 23 (14.56) 28 (10.45) 51 (11.97)
 Psychosocial questionnaire 144 (91.14) 251 (93.31) 395 (92.51)
Time 0 and Time 1
 Valid accelerometer data 95 (60.13) 177 (66.04) 272 (63.85)
 Psychosocial questionnaire 144 (91.14) 257 (95.54) 401 (93.91)
Time 0 and Time 2
 Valid accelerometer data 81 (51.27) 162 (60.45) 243 (57.04)
 Psychosocial questionnaire 144 (91.14) 251 (93.31) 395 (92.51)
  1. a One participant excluded as they could not wear accelerometer: accelerometer results are presented as a % of 268 for Intervention total and 426 for overall total.
  2. b Accelerometer worn, wear criteria met (≥ 2 valid weekdays, defined as ≥ 500 minutes of data between 05:00 and 23.59).
  3. c Accelerometer worn, wear criteria not met.
  4. d No data provided