Table 2 Sample sizes, mean (M) and standard deviation (SD) for chronological age (CA), skeletal age (SA), height, weight, estimated body composition and motor performances of soccer players of contrasting skeletal maturity status among players 9–12 and 13–16 years.

From: Influence of body size and skeletal maturity status on strength and motor performances of soccer players 9–16 years

 

Players 9–12 years

Players 13–16 years

Skeletal maturity status

Skeletal maturity status†

Late

Average

Early

F

Average

Early

F

n

M

SD

n

M

SD

n

M

SD

n

M

SD

n

M

SD

CA, yrs

9

11.4

0.8

26

11.0

1.0

25

11.5

0.9

1.84

26

14.3

1.0

26

14.6

1.0

1.09

Fels SA, yrs

9

9.6

1.1

26

11.2

1.2

25

13.4

0.9

51.67***

26

14.8

1.0

26

16.5

1.0

36.51***

Height, cm

9

142.6

6.9

26

144.5

6.2

25

152.3

8.6

9.23***

26

164.8

9.3

26

172.4

6.9

11.18**

Weight, kg

9

34.4

4.5

26

35.9

5.3

25

41.8

7.7

7.51***

26

52.0

8.2

26

61.1

6.7

19.04***

Fat-free mass, kg

9

28.8

3.4

26

29.3

3.9

25

34.2

6.2

7.52***

26

44.0

7.2

25

51.3

5.7

15.82***

Fat mass, kg

9

5.6

1.2

26

6.5

1.7

25

7.6

2.1

4.74**

26

8.0

1.6

25

9.6

1.7

11.01**

Fat mass, %

9

16.1

2.0

26

18.0

2.4

25

18.1

3.1

1.96

26

15.4

2.5

25

15.8

2.2

0.22

Grip strength, sum R + L, kg

9

33.7

6.2

26

35.4

5.8

24

42.8

7.4

10.49***

26

62.8

12.7

25

75.3

12.4

12.65***

5 m sprint, sec

8

1.17

0.08

25

1.18

0.10

25

1.17

0.09

0.11

24

1.08

0.08

19

1.06

0.06

1.13

20 m sprint, sec

8

3.52

0.23

25

3.60

0.18

25

3.58

0.23

0.48

24

3.18

0.20

19

3.08

0.18

2.95

Acceleration from 10 to 20 m, sec

8

2.01

0.11

25

2.05

0.11

25

2.05

0.13

0.33

24

1.82

0.11

19

1.78

0.11

1.54

Agility, sec

7

12.8

0.6

25

13.2

0.7

25

13.3

0.7

1.73

23

12.6

0.5

19

12.5

0.5

0.34

Vertical jump, cm

7

40.4

9.4

24

35.3

5.4

25

37.0

6.4

1.80

23

47.7

10.7

19

52.5

7.9

2.65

Endurance run, distance, m

          

18

1336

495

16

1740

506

5.54*

  1. †No players 13–16 years were late in skeletal maturity status; *p < 0.05 **p ≤ 0.01 ***p ≤ 0.001.
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