Table 2.
Mean differences in SCRuM variables between test-retest results for elite U19s
| Variable | Test | Re-test | Mean diff | Std diff | p | ES [95% CI] | Effect |
|---|---|---|---|---|---|---|---|
| Anthropometry | |||||||
| Body mass (kg) | 77.5 ± 9.6 | 77.6 ± 9.6 | −0.1 | 0.3 | 0.1 | −0.0 [−0.0–0.0] | Trivial |
| Height (m) | 1.7 ± 0.1 | 1.73 ± 0.1 | 0.0 | 0.1 | 0.8 | 0.0 [0.0–0.0] | Trivial |
| BMI (kgm-2) | 25.9 ± 3.3 | 26.0 ± 3.3 | −0.0 | 0.4 | 0.5 | −0.3 [−0.1–0.1] | Trivial |
| Biceps (mm) | 6.7 ± 3.6 | 6.46 ± 3.4 | 0.2 | 0.7 | 0.0* | 0.1 [0.0–0.2] | Trivial |
| Triceps (mm) | 9.4 ± 3.0 | 9.56 ± 2.8 | −0.1 | 1.2 | 0.5 | −0.0 [−0.1–0.2] | Trivial |
| Subscapular (mm) | 12.8 ± 2.7 | 12.9 ± 2.6 | −0.1 | 0.8 | 0.3 | −0.0 [−0.1–0.2] | Trivial |
| Suprailiac (mm) | 8.9 ± 3.8 | 9.02 ± 3.9 | −0.1 | 0.8 | 0.4 | −0.0 [−0.1–0.1] | Trivial |
| Abdomen (mm) | 11.4 ± 2.9 | 11.7 ± 3.2 | −0.3 | 1.4 | 0.2 | −0.1 [−0.3–0.2] | Trivial |
| Thigh (mm) | 10.0 ± 2.5 | 10.0 ± 2.5 | −0.0 | 1.3 | 0.9 | −0.0 [−0.0–0.0] | Trivial |
| Calf (mm) | 5.5 ± 1.0 | 5.54 ± 1.0 | −0.1 | 0.6 | 0.6 | −0.1 [−0.2–0.1] | Trivial |
| Sum of Skinfolds (mm) | 64.7 ± 15.6 | 65.2 ± 15.2 | −0.4 | 2.6 | 0.3 | −0.0 [−0.1–0.1] | Trivial |
| Physiological tests | |||||||
| 5m speed (s) | 1.1 ± 0.0 | 1.11 ± 0.0 | −0.0 | 0.0 | 0.07 | −0.3 [−0.8–0.3] | Small |
| 10m speed (s) | 2.0 ± 0.1 | 2.03 ± 0.2 | −0.0 | 0.1 | 0.23 | −0.1 [−0.4–0.2] | Trivial |
| 20m speed (s) | 3.3 ± 0.2 | 3.22 ± 0.2 | 0.0 | 0.1 | 0.06 | 0.2 [−0.2–0.5] | Trivial |
| 40m speed (s) | 5.6 ± 0.3 | 5.58 ± 0.3 | 0.0 | 0.1 | 0.11 | 0.1 [−0.1–0.2] | Trivial |
| L-run agility (s) | 6.2 ± 0.3 | 6.20 ± 0.3 | 0.0 | 0.2 | 0.77 | 0.0 [−0.1–0.1] | Trivial |
| Vertical jump (cm) | 47.8 ± 3.8 | 48.2 ± 3.8 | −0.3 | 1.4 | 0.15 | −0.1 [−0.3–0.1] | Trivial |
| Sit-and-reach (cm) | 7.9 ± 5.1 | 8.51 ± 4.9 | −0.6 | 2.0 | 0.05 | −0.1 [−0.4–0.2] | Trivial |
| 2-kg MBCT (m) | 9.3 ± 1.3 | 9.41 ± 1.3 | −0.2 | 0.6 | 0.05 | −0.1 [−0.4–0.1] | Trivial |
| 60-s push-up (s) | 49.7 ± 10.0 | 50.7 ± 10.6 | −1.0 | 3.7 | 0.08 | −0.1 [−0.3–0.1] | Trivial |
| Wall Sit Leg Strength (sec) | 146.1 ± 9.7 | 147.9 ± 8.3 | −1.9 | 4.1 | 0.01* | −0.2 [−0.6–(−0.1)] | Small |
| 1-RM Back Squat (kg) | 98.4 ± 14.8 | 98.8 ± 13.7 | −0.4 | 2.9 | 0.35 | −0.0 [−0.1–0.1] | Trivial |
| 1-RM Bench Press (kg) | 90.5 ± 16.4 | 90.7 ± 15.7 | −0.4 | 3.4 | 0.51 | −0.0 [−0.0–0.0] | Trivial |
| RHIE (s) | 39.3 ± 3.0 | 39.7 ± 2.7 | −0.4 | 1.8 | 0.20 | −0.1 [−0.4–0.2] | Trivial |
| Yo-Yo IRT (m) | 1505.9 ± 75.0 | 1522.4 ± 87.0 | −16.6 | 60.6 | 0.09 | −0.2 [−0.6–0.3] | Small |
| Game skills tests | |||||||
| Tackling (%) | 87.9 ± 8.4 | 89.5 ± 8.6 | −1.6 | 6.0 | 0.10 | −0.2 [−0.6–0.2] | Trivial |
| Passing Ability (au) | 116.2 ± 2.1 | 116.5 ± 1.5 | −0.3 | 1.4 | 0.18 | −0.2 [−0.5–0.1] | Trivial |
| Pass Accuracy (%) | 89.3 ± 7.3 | 90.7 ± 5.6 | −1.5 | 6.6 | 0.16 | −0.2 [−0.6–0.2] | Small |
| Catching (au) | 74.0 ± 1.1 | 74.2 ± 0.9 | −0.2 | 0.8 | 0.07 | −0.2 [−0.6–0.2] | Small |
Data are expressed as mean ± SD.
*
indicates significant difference (p<0.05).
Mean diff, Mean difference (test score-retest score); Std diff, Standard deviation difference; df, degrees of freedom; p value, 2 tailed probability value; ES, Cohen’s d effect size statistic with the 95% confidence interval; 2-kg MBCT, 2 kg medicine ball chest throw; 1-RM, one repetition maximum; RHIE, repeated high intensity exercise; Yo-Yo IRT, Yo-Yo intermittent recovery test; Tackling (%), Tackling proficiency test; m, metres; kg, kilograms; s, seconds; au, arbitrary units; cm, centimetres; Catching, running and catching ability test.