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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.