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Bone mass increase in puberty: what makes it happen?. Age-based reference ranges for annual height velocity in US children. Growth and pubertal development in children and adolescents: effects of diet and physical activity. Individual differences in boys' and girls' timing and tempo of puberty: modeling development with nonlinear growth models.
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Marceau K, Ram N, Houts RM, Grimm KJ, Susman EJ. The pubic hair is of normal adult distribution and volume. The scrotum and penis are of adult size and form. Sexual Maturity Rating 5: The testicles are of an adult size (greater than 20 ml in volume).Pubic hair is coarse, thicker, and curly like adult hair, though there are fewer hairs than an adult has. The scrotum grows larger and also darkens. The penis continues to grow in length and now becomes thicker. Sexual Maturity Rating 4: (From 12 years old to 17 years old) The testicles continue to grow.Pubic hairs become darker and curlier and more of them appear. Sexual Maturity Rating 3: (From 10 years old to 16 years old) The testes continue to grow in volume and size.A few pubic hairs become visible and they are long, straight, and slightly dark. The scrotum becomes reddened, thinner, and larger. Sexual Maturity Rating 2: (From 10 years old to 15 years old) The testicles grow in volume and size.
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Sexual Maturity Rating 1: (The prepuberty stage) The testes are small and the phallus (penis) is child-like.