What is the prevalence of precocious puberty?

Precocious puberty, defined as the onset of secondary sexual characteristics before the age of 8 years in girls and 9 years in boys, affects approximately 1 in 5,000 to 1 in 10,000 children. It is more common in girls than boys, with a ratio of approximately 4:1. The prevalence of precocious puberty has been increasing in recent decades, although the exact reasons for this increase are not fully understood.