For example, she said, "all the pubertal changes were based on visual inspections - no endocrine evaluations or hormonal measurements were done."

The Leydig cells produce testosterone, which in turn produces most of the male pubertal changes.

Boys may be slower to notice the early pubertal changes, which begin with slow testicular enlargement, probably triggered by the follicle-stimulating hormone (FSH).

After stopping GnRH agonists, pubertal changes resume within 3-12 months.

For example, researchers in neuroscience or bio-behavioral health might focus on pubertal changes in brain structure and its effects on cognition or social relations.

In contrast, boys accelerate more slowly but continue to grow for about 6 years after the first visible pubertal changes.

Variations in pattern of pubertal changes in girls.

She analyzed over 336 teenagers and found "ratings of physical attractiveness and body image remain relatively stable across the early teenage years, but become increasingly negative around age 15-18 years because of pubertal changes".

Approximate mean ages for the onset of various pubertal changes are as follows.