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Table 2 Descriptive variables of handball players according to their age

From: Physical fitness and throwing speed in U13 versus U15 male handball players

  U13 U15 Age Effect size
Age (years) 13.0 ± 0.6 14.9 ± 0.5 288.4 (< 0.001) 3.42 (4.02; 2.83)
Body height (cm) 162.0 ± 7.8 172.2 ± 7.1 43.1 (< 0.001) 1.32 (1.76; 0.89)
Body mass (kg) 54.9 ± 11.7 63.6 ± 10.9 14.0 (< 0.001) 0.75 (1.16; 0.34)
APHV (years) 14.0 ± 0.6 14.4 ± 0.6 9.2 (0.003) 0.61 (1.02; 0.21)
MO (years) − 1.0 ± 0.7 0.6 ± 0.8 104.8 (< 0.001) 2.06 (2.54; 1.59)
  1. One-way independent measures ANOVAs with Age as between subject factor
  2. ANOVA main effects (Age) are presented as F values (p). Effect sizes were calculated as Hedge’s g. Positive effect sizes denote that U15 showed better performances than U13. Effect sizes were presented as means (95% confidence intervals)
  3. U13 = under 13 years; U15 = under 15 years; APHV = age at peak height velocity; MO = maturity offset; cm = centimeters; kg = kilograms