Table 4.
Descriptive, M ±SD (n), and inferential analyses for the factor “power and flexibility.”
| 2002 to 2005 | 2012 to 2015 | Mean difference [95% CI] | t-statistic | p | Cohen’s d [95% CI] | |
|---|---|---|---|---|---|---|
| Countermovement jump (cm) | ||||||
| U13 | 26.5 ± 5.1 (890) | 27.7 ± 4.2 (967) | 1.2 [0.8; 1.6] | 5.50 | < 0.001 | 0.26 [0.16; 0.35] |
| U14 | 28.8 ± 5.4 (999) | 29.9 ± 4.6 (905) | 1.2 [0.7; 1.6] | 5.18 | < 0.001 | 0.24 [0.15; 0.33] |
| U15 | 33.0 ± 5.7 (769) | 34.1 ± 4.7 (869) | 1.0 [0.5; 1.6] | 4.01 | < 0.001 | 0.20 [0.10; 0.30] |
| U16 | 36.5 ± 5.3 (550) | 36.6 ± 4.8 (742) | 0.1 [–0.4; 0.7] | 0.42 | 0.676 | 0.02 [–0.09; 0.13] |
| U17 | 38.1 ± 5.5 (474) | 38.0 ± 4.6 (483) | 0.0 [–0.7; 0.6] | –0.15 | 0.882 | –0.01 [–0.14; 0.12] |
| U18 | 39.6 ± 5.3 (260) | 39.3 ± 4.7 (283) | –0.3 [–1.2; 0.5] | –0.75 | 0.454 | –0.06 [–0.23; 0.10] |
| Drop jump (coeff.) | ||||||
| U13 | 5.13 ± 1.74 (886) | 5.27 ± 1.84 (965) | 0.14 [–0.03; 0.30] | 1.63 | 0.103 | 0.08 [–0.02; 0.17] |
| U14 | 5.69 ± 1.86 (997) | 5.71 ± 1.99 (906) | 0.03 [–0.15; 0.20] | 0.32 | 0.747 | 0.01 [–0.08; 0.10] |
| U15 | 6.46 ± 1.99 (765) | 6.48 ± 1.80 (862) | 0.02 [–0.17; 0.20] | 0.17 | 0.861 | 0.01 [–0.09; 0.11] |
| U16 | 7.38 ± 2.07 (544) | 7.34 ± 2.01 (738) | –0.04 [–0.26; 0.19] | –0.32 | 0.751 | –0.02 [–0.13; 0.09] |
| U17 | 8.09 ± 2.16 (470) | 7.96 ± 2.05 (481) | –0.14 [–0.40; 0.13] | –0.99 | 0.321 | –0.06 [–0.19; 0.06] |
| U18 | 8.55 ± 2.31 (259) | 8.25 ± 2.06 (281) | –0.30 [–0.67; 0.07] | –1.59 | 0.112 | –0.14 [–0.31; 0.03] |
| 2 kg overhead medicine ball throw (m) | ||||||
| U13 | 5.9 ± 1.2 (886) | 5.8 ± 1.0 (964) | –0.1 [–0.2; 0.0] | –1.20 | 0.231 | –0.06 [–0.15; 0.04] |
| U14 | 6.9 ± 1.5 (994) | 6.7 ± 1.2 (902) | –0.1 [–0.3; 0.0] | –2.28 | 0.023 | –0.10 [–0.19; -0.01] |
| U15 | 8.5 ± 1.5 (765) | 8.6 ± 1.4 (867) | 0.1 [–0.1; 0.2] | 1.15 | 0.250 | 0.06 [–0.04; 0.15] |
| U16 | 10.0 ± 1.4 (549) | 9.7 ± 1.4 (738) | –0.3 [–0.4; -0.1] | –3.69 | < 0.001 | –0.21 [–0.32; -0.10] |
| U17 | 10.7 ± 1.4 (473) | 10.6 ± 1.3 (483) | –0.1 [–0.3; 0.1] | –1.00 | 0.315 | –0.06 [–0.19; 0.06] |
| U18 | 11.1 ± 1.4 (259) | 11.3 ± 1.4 (282) | 0.2 [0.0; 0.4] | 1.69 | 0.092 | 0.15 [–0.02; 0.31] |
| Sit-and-reach (cm) | ||||||
| U13 | 6.2 ± 5.2 (887) | 3.4 ± 5.5 (965) | –2.8 [–3.3; -2.3] | –11.29 | < 0.001 | –0.52 [–0.62; -0.43] |
| U14 | 7.6 ± 5.5 (998) | 4.6 ± 5.3 (906) | –3.0 [–3.5; -2.5] | –11.98 | < 0.001 | –0.55 [–0.64; -0.46] |
| U15 | 9.7 ± 6.1 (769) | 8.6 ± 6.0 (866) | –1.2 [–1.7; -0.6] | –3.84 | < 0.001 | –0.19 [–0.29; -0.09] |
| U16 | 12.5 ± 6.0 (549) | 10.2 ± 6.4 (738) | –2.3 [–3.0; -1.7] | –6.71 | < 0.001 | –0.38 [–0.49; -0.27] |
| U17 | 13.0 ± 6.1 (473) | 10.9 ± 6.3 (481) | –2.0 [–2.8; -1.3] | –5.12 | < 0.001 | –0.33 [–0.46; -0.20] |
| U18 | 13.0 ± 5.9 (261) | 11.1 ± 6.3 (281) | –1.8 [–2.9; -0.8] | –3.49 | 0.001 | –0.30 [–0.47; -0.13] |