Clinical and epidemiological insights into early puberty in Thai girls: a 5-year study

There is growing global concern about the shift to earlier onset of puberty among girls; however, the prevalences of precocious and normal variant puberty among Thai girls are uncertain. We conducted a study at King Chulalongkorn Memorial Hospital in Bangkok from 2018 to 2022 (amid the coronavirus disease 2019 pandemic) to investigate the prevalence, characteristics, and treatment of early puberty in a large cohort of Thai girls.

The medical records of 583 girls who had been evaluated for early puberty were reviewed. Demographic and clinical characteristics, and treatment approaches were analyzed.

The analyses found a significant annual increase in evaluations for early signs of puberty (P-value for trend 0.04). The majority (71.2%) of cases were categorized as gonadotropin-releasing-hormone (GnRH)-dependent or central precocious puberty (CPP), with 16 cases showing abnormal brain magnetic resonance imaging findings. Among girls with normal variant puberty, early normal puberty was the most common category (10.5%), followed by premature thelarche (9.5%), slow-progressive precocious puberty (6.6%), and premature adrenarche (2.2%). Median age at presentation, basal luteinizing hormone (LH) and follicle-stimulating hormone (FSH), and bone age differed significantly among groups. Importantly, 97% of girls with CPP received GnRH agonists. Girls with CPP exhibited higher body mass index z-scores and basal LH and FSH compared with those with slow-progressive precocious puberty.

Our analyses of the prevalence, characteristics, and treatment of early puberty in Thai girls highlighted the impact of obesity on pubertal timing. The findings underscore the need for preventive weight management and country-specific guideline updates to enhance healthcare strategies for young girls.