Stage of puberty | Age (mean ± SD) | Genitalia | Serum testosterone (ng/dL) |
1 | Prepubertal | 87 | |
2 | 11.6±1.1 | Beginning enlargement of scrotum and testes; change in texture and reddening of scrotal skin | 251 |
3 | 12.9±1.0 | Beginning growth of the penis, mainly in length; further growth of testes and scrotum | 336 |
4 | 13.8±1.0 | Further growth of penis in length and breadth; further darkening of scrotal skin | 525 |
5 | 14.9±1.1 | Adult size genitalia | 571 |
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