Table 1.

Subject characteristics and age categories in Swiss youth male and female soccer.

Age group	N	Age
Mixed sex football
U8	3,956 (286 ♀)	6.4 ± 1.1
U10	8,316 (460 ♀)	8.1 ± 1.2
U12	23,234 (1,349 ♀)	9.7 ± 0.8
U14	23,276 (1,142 ♀)	11.5 ± 0.7
U16	17,870 (948 ♀)	13.5 ± 0.7
U18	13,250 (91 ♀)	15.5 ± 0.7
U20	9,817 (39 ♀)	17.7 ± 1.0
Subtotal U8 to U20	99,719 (4,315 ♀)
Female football (FF)
FF-12	561	10.3 ± 1.1
FF-15	2,880	12.8 ± 1.3
FF-19	1,994	15.5 ± 1.2
Subtotal FF12 to FF19	5,435
Total ♂+♀	109,469

♀, female; ♂, male.