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Table 2 Demographics for players who took part in both baseline and follow-up measurements

From: Performance Effects with Injury Prevention Exercise Programmes in Male Youth Football Players: A Randomised Trial Comparing Two Interventions

  Knee Control Knee Control+
No. of players 21 26
Age years, mean (SD) 13.8 (0.7) 14.5 (0.6)
Years of football experience, mean (SD) 6.1 (2.0) 8.7 (1.8)
Active in other sports, n 1 sport (7), 2 sports (2) 1 sport (10), 2 sports (4)
Football profile at school, n 10 12
Other sports profile at school, n 2 6
No. of football training sessions/week at baseline, mean (SD) 4.6 (1.1) 4.5 (1.4)
Perceived training volume at baseline, mean (SD)a 6.1 (1.0) 5.7 (1.0)
Previous experience of using the Knee Control IPEP, n Yes, regularly (0), yes, sporadically (4), no (16), missing (1) Yes, regularly (0), yes, sporadically (8), no (18)
  1. Values are mean and standard deviation (SD) or n
  2. IPEP injury prevention exercise programme
  3. aLikert scale 1–7, where 1 represents extremely low training volume and 7 extremely high training volume
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