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1) Puberty is the biological changes and sexual maturation that occur during the transition from childhood to adulthood, with the average age of onset being 10-13 years for girls and 12-15 years for boys. 2) Precocious and delayed puberty are disorders defined by puberty onset more than 2 standard deviations outside typical ages. Evaluation of puberty issues includes medical history, physical exam focusing on growth and sexual development, and basic lab tests. 3) Common causes of delayed puberty include constitutional delay, chronic illnesses, nutritional deficiencies, and hormonal disorders; while precocious puberty can be gonadotropin-dependent or -independent. Health care providers must provide long-term

















