Table 1 Frequency distribution of Tanner stages classified by chronological age groups in trained and untrained subjects. Data are presented as the number (%). Tanner Stage Age Groups Total 11 yr 12 yr 13 yr 14 yr 15 yr Trained Group I 5 (33.3%) 1 (6.7%) 0 (0%) 0 (0%) 0 (0%) 6 II 10 (66.7%) 10 (66.7%) 2 (14.3%) 0 (0%) 0 (0%) 22 III 0 (0%) 2 (13.3%) 9 (64.3%) 2 (14.3%) 1 (6.7%) 14 IV 0 (0%) 2 (13.3%) 3 (21.4%) 8 (57.1%) 3 (20.0%) 16 V 0 (0%) 0 (0%) 0 (0%) 4 (28.6%) 11 (73.3%) 15 Untrained Group Group I 8 (53.3%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 8 II 7 (46.7%) 10 (66.7%) 3 (21.4%) 1 (6.7%) 0 (0%) 21 III 0 (0%) 5 (33.3%) 9 (64.3%) 4 (26.7%) 2 (13.3%) 20 IV 0 (0%) 0 (0%) 2 (14.3%) 7 (46.7%) 4 (26.7%) 13 V 0 (0%) 0 (0%) 0 (0%) 3 (20.0%) 9 (60.0%) 12