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Table 3 Results at baseline and follow-up and comparisons of change between groups

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

   Mean (95% CI) Between-group difference in change (95% CI); p value; Cohen´s d
Whole sample Knee Control Knee Control+
Agility t test (s) Baseline (1) 11.89 (11.68 to 12.11) 12.24 (11.92 to 12.56) 11.61 (11.33 to 11.89)  
Follow-up (2) 12.03 (11.82 to 12.24) 12.30 (11.97 to 12.63) 11.81 (11.52 to 12.1)  
Change (2)-(1) 0.14 (0.02 to 0.25) 0.06 (− 0.12 to 0.25) 0.20 (0.04 to 0.37) − 0.139 (− 0.402 to 0.124); p = 0.293; d = 0.32
Single-leg hop for distance, right leg (cm) Baseline (1) 143.15 (138.92 to 147.38) 140.4 (133.6 to 147.2) 145.3 (139.2 to 151.3)  
Follow-up (2) 143.40 (138.35 to 148.46) 139.6 (131.4 to 147.7) 146.4 (139.2 to 153.6)  
Change (2)-(1) 0.26 (− 2.62 to 3.13) − 0.87 (− 5.53 to 3.79) 1.16 (− 2.97 to 5.3) − 2.034 (− 8.637 to 4.569); p = 0.538; d = 0.191
Single-leg hop for distance, left leg (cm) Baseline (1) 143.73 (138.49 to 148.98) 139.7 (131.3 to 148.1) 146.9 (139.4 to 154.4)  
Follow-up (2) 144.43 (138.91 to 149.94) 140 (131.2 to 148.9) 147.9 (140 to 155.7)  
Change (2)-(1) 0.69 (− 3.19 to 4.57) 0.35 (− 5.98 to 6.67) 0.97 (− 4.64 to 6.58) − 0.623 (− 9.589 to 8.343); p = 0.889; d < 0.02
505 agility test (s) Baseline (1) 2.60 (2.55 to 2.64) 2.63 (2.56 to 2.7) 2.57 (2.5 to 2.63)  
Follow-up (2) 2.61 (2.57 to 2.65) 2.58 (2.51 to 2.65) 2.63 (2.57 to 2.69)  
Change (2)-(1) 0.01 (− 0.02 to 0.05) 0.05 (0.1 to3.18) 0.07 (0.02 to 0.11) 0.118 (0.192 to0.044); p = 0.002; d = 0.975
Side-hop right (n) Baseline (1) 37.75 (34.33 to 41.16) 37.63 (32.07 to 43.19) 37.83 (32.9 to 42.76)  
Follow-up (2) 39.28 (35.31 to 43.24) 42.71 (36.38 to 49.03) 36.50 (30.89 to 42.11)  
Change (2)-(1) 1.53 (− 1.63 to 4.70) 5.08 (0.11 to 10.05) − 1.33 (− 5.74 to 3.07) 6.414 (− 0.633 to 13.46); p = 0.073; d = 0.553
Side-hop left (n) Baseline (1) 35.61 (31.65 to 39.57) 34.21 (27.8 to 40.62) 36.77 (30.97 to 42.58)  
Follow-up (2) 37.83 (33.69 to 41.96) 37.00 (30.28 to 43.72) 38.51 (32.43 to 44.59)  
Change (2)-(1) 2.22 (− 0.71 to 5.15) 2.79 (− 1.97 to 7.54) 1.74 (− 2.56 to 6.04) 1.049 (− 5.792 to 7.89); p = 0.759; d = 0.09
10-m sprint (s) Baseline (1) 1.88 (1.85 to 1.91) 1.88 (1.83 to 1.92) 1.87 (1.83 to 1.92)  
Follow-up (2) 1.90 (1.86 to 1.93) 1.91 (1.85 to 1.96) 1.89 (1.84 to 1.94)  
Change (2)-(1) 0.02 (0.01 to 0.04) 0.03 (0 to 0.06) 0.01 (− 0.01 to 0.04) 0.014 (− 0.029 to 0.057); p = 0.521; d = 0.191
20-m sprint (s) Baseline (1) 3.37 (3.31 to 3.42) 3.38 (3.28 to 3.47) 3.36 (3.28 to 3.44)  
Follow-up (2) 3.39 (3.33 to 3.45) 3.39 (3.29 to 3.49) 3.39 (3.31 to 3.48)  
Change (2)-(1) 0.03 (− 0.00 to 0.05) 0.02 (− 0.03 to 0.06) 0.03 (− 0.01 to 0.07) − 0.016 (− 0.078 to 0.047); p = 0.616; d = 0.155
Countermovement jump (m) Baseline (1) 0.25 (0.24 to 0.26) 0.24 (0.22 to 0.26) 0.25 (0.24 to 0.27)  
Follow-up (2) 0.24 (0.23 to 0.25) 0.23 (0.21 to 0.25) 0.25 (0.23 to 0.26)  
Change (2)-(1) 0.01 (0.02 to 0.00) − 0.01 (− 0.02 to 0) − 0.01 (− 0.02 to 0) − 0.002 (− 0.02 to 0.015); p = 0.801; d = 0.063
  1. Age-adjusted results are reported for the two intervention groups at baseline and follow-up, and their change between time points, as well as between-group differences in change, from the intention to treat analysis. Bold text indicates a statistically significant within-group difference from baseline to follow-up p < 0.05. Text in italic indicates a statistically significant between-group difference in change p < 0.05.
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