Although functional dyspepsia (FD) is a common functional gastroduodenal disorder with a
high socioeconomic burden, little is known about its global prevalence. Thus, we performed …

Background There is limited comprehensive evidence on the potential association between
early menarche and subsequent health outcomes. Aim To evaluate the existing evidence for …

Background: Some data suggest a higher incidence of diagnosis of autoimmune
inflammatory rheumatic diseases (AIRDs) among patients with a history of COVID-19 …

Importance Despite the COVID-19 pandemic's effect on daily life, limited research exists on
the prevalence and risk factors of suicidality and sadness among South Korean adolescents …

Importance Only a few studies have examined the long-term trends of hand and oral
hygiene, especially among adolescents. Objective To investigate the 15-year trends in …

Studies on the trends in the prevalence of rheumatoid arthritis (RA) and osteoarthritis (OA)
are limited, particularly during the COVID-19 pandemic. This study aimed to analyze the …

Importance There is a lack of comprehensive data on the association of the COVID-19
pandemic with the prevalence of physical activity in large-scale data sets. Objective To …

The hygiene hypothesis suggests that pet exposure is effective in preventing allergic
disease, and some studies have reported the beneficial effects of dog exposure during fetal …

Little is known about the prevalence of chronic kidney disease (CKD) during the coronavirus
disease 2019 (COVID-19) pandemic. We aimed to investigate the long-term trends in CKD …

Benefits of breastfeeding for both the mother and the child are well established, but a
comprehensive and robust study to investigate the protective effect of breastfeeding and …