Impact of the COVID-19 pandemic on the incidence of central precocious puberty: A PRISMA-ScR-COMPLIANT scoping review

Puberty is a biological maturation process that involves genetic, nutritional, environmental, ethnic, and lifestyle factors. During the coronavirus 2019 (COVID-19) pandemic, an increase in referrals for central precocious puberty (CPP) assessment was observed in clinical practice. The aim of this review was to evaluate the incidence of CPP in different countries before and during the COVID-19 pandemic. A PRISMA-ScR-compliant scoping review was performed in the MEDLINE and Embase databases using "puberty" and "COVID-19" as search terms. Exclusion criteria were an identifiable organic cause of CPP, genetic disorders or peripheral precocious puberty. The study was registered in OSF. A total of 26 studies with participants from 11 countries were included. Twenty-five studies found a 1.3- to 5-fold increase in the incidence of CPP in girls. In boys, 4 studies found no significant difference in the number of cases, 3 studies found a 2.8- to 3.4-fold increase, and 1 study detected a 75% decrease. Twelve studies reported an increase in the use of electronic devices, sedentary lifestyles, higher Z-scores for weight and body mass index, increased sleep disturbances, and a lower age at the onset of puberty. Seven studies found no significant differences in clinical and laboratory parameters between the pandemic and pre-pandemic periods. There was an increase in the incidence of precocious puberty among girls during the COVID-19 pandemic. This finding was not consistently observed in boys. Increased screen time, reduced physical activity, psychological stress, changes in diet and sleep habits, and the direct effects of SARS-CoV-2 may have caused these results.