The players with high compliance completed twice as many
injury prevention sessions as the players with intermediate
compliance (1.5 vs 0.7 sessions per week). Interestingly, the
preventive effect of The 11+ therefore increased with the rate
of use, at least when conducted more than 1.5 times per week
on average. No studies have similarly compared the risk of
injury in players and teams with high, intermediate and low
compliance with an intervention to prevent injuries. However,
similar indications of exposure–response relationships have
been found previously.28 Furthermore, a post hoc analysis
showed that compared with the controls,33 players with high
compliance experienced a 45% reduction in the overall risk of
injury (data not shown), that is, an even greater effect than
when compared with intervention players with intermediate
and low compliance.