Table 4. Effects of FIFA 11+ intervention on injury risk in players based on secondary outcomes. INT Group CON Group n Incidence (x1000 hrs) n Incidence (x1000 hrs) z-test Rate Ratio (95% CI) P-value Injury by Body Location Upper Extremity Injuries 10 .2 18 .3 - .38 .86 (.41 – 1.84) .706 Thigh Injuries 1 .0 14 .2 - 1.95 .19 (.04 – 1.01) .052 Knee Injuries 12 .3 21 .3 - 1.92 .93 (.47 – 1.88) .848 Ankle Injuries 10 .2 30 .5 - 1.75 .53 (.27 – 1.08) .080 Lower Leg Injuries 2 .0 3 .0 - - - Injury by Aetiology Overuse Injuries 2 .0 14 .2 - 1.96 .26 (.07 – 0.98) .047* Acute Injuries 34 .9 80 1.3 - 2.09 .65 (.44 – 0.97) .037* Injury by Mechanism Contact Injuries 27 .6 66 1.1 - .98 .65 (.27 – 1.54) .328 Non-contact Injuries 7 .2 16 .3 - 1.91 .65 (.42 – 1.01) .056 Injury by Severity Minimal Injuries 7 .2 23 .4 - 1.50 .52 (.23 – 1.21) .133 Mild Injuries 7 .2 27 .4 - 2.08 .42 (.19 – 0.95) .037 * Moderate Injuries 14 .3 33 .5 - 1.40 .64 (.35 – 1.19) .162 Severe Injuries 7 .2 9 .2 .170 1.09 (.42 – 2.83) .865 * Significant at p < 0.05. CI – Confidence Interval, INT – Intervention, CON – Control