Prevalence and Patterns of Social Media Use in Early Adolescents.

Objective: To describe patterns of social media use, including underage (under 13 years) use and sex differences, in a diverse, national sample of early adolescents in the U.S.

Methods: We analyzed the social media use data in the Adolescent Brain Cognitive Development Study (2019-2021, Year 3), which includes a national sample of early adolescents in the U.

Exploring body ideal internalization, sociocultural pressures, and probable muscle dysmorphia in Canadian and American boys and men.

This study aimed to determine whether the internalization of body ideals and sociocultural pressures to adhere to body ideals are associated with a greater likelihood of having probable muscle dysmorphia. Cross-sectional data from 1553 boys and men ages 15-35 from Canada and the United States were used. Multiple logistic regression analyses determined the association between the internalization of three body ideals, sociocultural pressures to adhere to body ideals from four sources, and having probable muscle dysmorphia.

Clinical characteristics of hospitalized male adolescents and young adults with avoidant/restrictive food intake disorder (ARFID).

Background: Avoidant/restrictive food intake disorder (ARFID) may result in significant medical sequelae. Compared to youth with eating disorders like anorexia nervosa (AN), youth with ARFID tend to be younger and are more likely to be male. We aim to describe sex differences in clinical characteristics of youth hospitalized for medical complications of ARFID and compare their characteristics with youth hospitalized for anorexia nervosa.

Androgens induce renal synthesis of urinary lipocalin-family protein, a potential inter-sexual transmitter in viviparous rockfish.

In viviparous black rockfish (Sebastes schlegelii), the kidney of reproductive-phase males actively produces lipocalin-type prostaglandin D synthase homolog (LPGDSh) protein, which is presumably involved in inter-sexual communication when emitted in the urine. The present study was undertaken to discover whether androgens and their nuclear receptors (Ars) are engaged in regulation of renal LPGDSh protein synthesis in black rockfish. Quantitative real-time polymerase chain reaction, in conjunction with immunohistochemistry and highly sensitive enzyme-linked immunosorbent assay, revealed that intra-abdominal administration of a synthetic androgen, 17α-methyltestosterone (MT), to juvenile black rockfish induced their renal expression of LPGDSh transcript and protein.

Race disparities in dental care use from adolescence to middle adulthood in the USA.

Background: This study examines the longitudinal patterns of dental care use from adolescence to middle adulthood (ages 11-43) and investigates racial and ethnic disparities in these patterns.

Methods: Data from Waves I through V of the National Longitudinal Study of Adolescent to Adult Health (1993-2018; ages 11-43). Semiparametric group-based trajectory model identified distinct dental care use trajectories.