Table 2 Effects of age for anthropometrical, hormone profile, physical fitness, general perceptual motor skill, soccer skill and soccer-specific laboratory test variables. Main Effect Between age groups (p<) F(2,33) p< η2 10y-12y 12y-14y 10y-14y Anthropometrics Height (m) 22.604 .001 .57 .01 .01 .001 Weight (kg) 27.937 .001 .63 .01 .01 .001 Fat (%) 1.203 ns. .07 - - - Muscle Mass (kg) 30.866 .001 .65 .01 .001 .001 Hormone Profile Testosterone (nmol/l) 31.778 .001 .66 .001 .01 .001 Physical Fitness 10m (s) 21.639 .001 .57 ns. .001 .001 Agility (s) 14.023 .001 .46 .05 .05 .001 CMJ (cm) 13.903 .001 .46 ns. .01 .001 General Perceptual Motor Skills PAT (s) 1.555 ns. .09 - - - EHF (times/30s) 21.371 .001 .56 .001 ns. .001 Soccer Skills Dribbling (s) 12.102 .001 .42 ns. .01 .001 Passing (s) 12.623 .001 .43 .05 .05 .001 ∑ Skill (s) 13.407 .001 .45 ns. .01 .001 Soccer-Specific Laboratory Test Time (s) 3.378 .05 .17 ns. ns. .05   Anticipation (s) 15.012 .001 .48 ns. .01 .001   Dribbling (s) 1.087 ns. .06 - - -   Reaction (s) 2.895 ns. .15 - - -   Aiming (s) 1.581 ns. .09 - - -   Passing (s) 11.402 .001 .41 .05 ns. .001 Accuracy (penalty pts.) 2.504 ns. .15 - - - CMJ = counter movement jump, PAT = peripheral awareness, EHF = Eye-Hand-Foot Coordination