BACKGROUND: Early adolescents who are new to Canada experience dual challenges of navigating developmental changes and multiple cultures. This study examined how changes in early adolescents\' emotional health from ages 9 to 12 differed by immigration background, and to what extent peer belonging and supportive school climate protected or promoted their emotional health.
METHODS: This study drew upon linked self-report and administrative data. Across 10 school districts in British Columbia, Canada, N = 4479 non-immigrant, immigrant, and refugee adolescents reported on their peer belonging, school climate, and emotional health (life satisfaction, optimism, self-esteem, sadness, worries) in Grades 4 and 7, using the Middle Years Development Instrument. Immigration background including immigration class (economic, family, refugee) and generation status (first, second) were obtained from linked Immigration, Refugees, and Citizenship Canada data. Multi-level modeling assessed the effect of time (grade level), immigration group, and changes in peer belonging and school climate on changes in self-reported emotional health. Analyses were adjusted for gender, English first language, and low family income.
RESULTS: Immigrant and refugee adolescents reported worse emotional health in Grade 4 compared to non-immigrants. Non-immigrant and immigrant adolescents reported declines in emotional health from Grades 4 to 7. In contrast, first-generation refugee adolescents reported significant improvements in life satisfaction, and first- and second-generation refugees reported improvements in worries over this period. Perceived improvements in peer belonging and school climate were associated with positive changes in emotional health for all adolescents.
CONCLUSIONS: Changes in adolescents\' emotional health from Grades 4 to 7 differed between immigrants, refugees, and non-immigrants. Immigrants and refugees who enter adolescence with lower emotional health than their non-immigrant peers may particularly benefit from culturally responsive school and community-based interventions.

A 15-year-old female with Hodgkin\'s lymphoma underwent ovarian tissue cryopreservation for preserving fertility in Reproductive Department of Sir Run Run Shaw Hospital, Zhejiang University School of Medical after receiving one course of chemotherapy. During the ovarian tissue cryopreservation, one MⅡmature oocyte and three germinal vesicle oocytes were found. The three immature oocytes underwent in vitro maturation but failed. Ultimately, one mature oocyte and 12 ovarian cortex slices were cryopreserved using vitrification. This case indicates that for patients with established gonadal axis feedback, ovarian tissue cryopreservation may not be the only method for fertility preservation. It is advisable to consider ovarian stimulation and oocyte retrieval for oocyte cryopreservation. Alternatively, for individuals in the ovulation phase of their menstrual cycle, attempting oocyte retrieval before ovarian tissue cryopreservation to obtain mature oocytes from the natural cycle, followed by oocyte cryopreservation, may enhance the likelihood of successful fertility preservation.
一例15岁霍奇金淋巴瘤患者行一个疗程化疗后来浙江大学医学院附属邵逸夫医院生殖中心进行生育力保存。在卵巢组织冷冻保存期间发现1枚MⅡ成熟卵母细胞和3枚生发泡期卵母细胞。3枚未成熟卵母细胞行体外成熟培养未获得成熟卵子，最终玻璃化冷冻1枚成熟卵母细胞和12片卵巢皮质。提示对于青春期性腺轴反馈已建立患者，卵巢组织冷冻不是唯一的生育力保存方式，可考虑促排卵取卵冻存卵母细胞，或根据月经周期判断处于排卵期者，在卵巢组织冷冻前尝试穿刺取卵获得自然周期成熟卵母细胞行卵母细胞冷冻，从而提高患者生育力保存概率。.

This study examined the contribution of early vs. concurrent maternal guidance of emotion dialogues with their children to the security and coherence of the children\'s attachment representations as adolescents. Maternal Sensitive Guidance was assessed from mother-child emotion dialogues when participants were preschoolers (approximate age 4 years) and young adolescents (approximate age 12.5 years), along with an assessment of adolescents\' attachment representations using the Friends and Family Interview (FFI). Mothers\' Sensitive Guidance in preschool predicted adolescents\' coherence in the FFI, secure maternal (but not paternal) representations, and a positive representation of sibling relationships. In contrast, mothers\' concurrent Sensitive Guidance was related only to adolescents\' sibling relationships. These results highlight the significance of mothers\' sensitive guidance of emotion dialogues during the early years for their children\'s later attachment representations, and point to the need for further examination of mothers\' role when they guide emotion dialogues with their adolescents.

OBJECTIVE: Growing research highlights the negative impact of sleep problems on adolescent mental health. However, the developmental trajectory of sleep problems during adolescence and their relationship with mental health difficulties, including both internalizing and externalizing symptoms, remain unclear. Additionally, the direction of the effects between sleep problems and mental health difficulties is not well established. This study aims to identify the developmental trajectories of sleep problems and examine their association with mental health difficulties in both internalizing and externalizing domains.
METHODS: The study involved 1,281 Chinese middle school students (645 males, mean age at initial assessment = 12.73, SD = 0.68). Data were collected at four time points (T1, T2, T3, T4) over approximately 6-month intervals, spanning from the first semester of seventh grade to the second semester of 8th grade.
RESULTS: Latent growth modeling revealed an overall increasing trend in sleep problems. Parallel latent growth modeling indicated that trajectories of sleep problems were positively related to the developmental trends of mental health difficulties, as shown by intercept-intercept and slope-slope associations. The cross-lagged panel model demonstrated significant bidirectional associations between sleep problems and internalizing symptoms. In contrast, we observed unidirectional associations between sleep problems and externalizing symptoms. Hence, sleep problems were a significant predictor of subsequent externalizing symptoms, with no significant reverse effect observed.
CONCLUSIONS: These findings suggest that future research should explore whether interventions targeting sleep problems can reduce the incidence of both internalizing and externalizing symptoms. Additionally, interventions aimed at internalizing symptoms may potentially improve adolescent sleep, while those targeting externalizing symptoms may not have the same effect.

This article investigates the phenomenon of sports abandonment among young scholars aged between 8 and 13 years. Regardless of the growing awareness of the importance of sport and physical activity during childhood and adolescence, this theme must be adequately explored in the scientific literature. Our study addresses this gap through a cross-sectional research design, tracking and analyzing data from a cohort of young athletes over one year. The main objective of our study is to identify the determinants leading to sports dropout in this specific age group. We looked at several possible causes through a multivariate analysis, including social pressures, parental expectations, time conflicts, physical and psychological stress, and lack of enjoyment. The results show a significant attrition rate, with psychosocial factors emerging as the most influential in determining whether a young person will continue or stop their participation in sport. Furthermore, our study highlights the importance of targeted interventions and preventive strategies that promote a positive, inclusive, and balanced sports environment for adolescents. These interventions can be particularly effective when implemented by coaches, parents and others involved in youth sports education. Finally, this paper discusses the implications of the findings for sports professionals, physical educators, and public policy makers. It highlights the need for more effective support policies and innovative pedagogical approaches to promote sporting persistence during adolescence. Our findings can serve as a starting point for further research in this field, helping to build a future where young people can enjoy the many benefits of sport and physical activity.

UNASSIGNED: Friends are major sources of social support for adolescents. This support may sometimes lead to co-rumination when the problem is discussed exhaustively with a focus on negative feelings. Co-rumination has been associated with some forms of anxiety, including clinical symptoms. Further studies are needed to investigate whether this association extends to additional and non-clinical forms of anxiety in youth. This study aimed to explore the relationship between co-rumination and trait anxiety, test anxiety, and anxiety sensitivity using secondary data.
UNASSIGNED: In this 2019 cross-sectional study, 1204 (59% girls) Canadian 6th-grade early adolescents (ages 11-12) and 11th-grade late adolescents (ages 16-17) completed self-report questionnaires measuring co-rumination, trait anxiety, test anxiety, and anxiety sensitivity.
UNASSIGNED: Co-rumination was associated with anxiety sensitivity in early adolescents and with trait anxiety, test anxiety, and anxiety sensitivity in late adolescents.
UNASSIGNED: Developmental factors may play a role in the association between co-rumination and different forms of anxiety. Anxiety sensitivity may appear alongside co-rumination in early adolescence and may broaden to trait and test anxiety in late adolescence. These results extend our understanding of the relationship between co-rumination and anxiety, as well as generate hypotheses for future longitudinal studies.

Twin births are related with maternal and fetal adverse outcomes. Little was known about the comparability of the cognitive, behavioral development and brain structure between twins and singletons in early adolescence. This retrospective cohort study was based on data from the United States population-based, prospective, longitudinal observational Adolescent Brain Cognitive Development study. Children with complete twin status information were enrolled, and the exposure variable was twin status. Primary outcomes were cognitive, behavioral development and brain structure in early adolescence. Cognitive and behavioral outcomes were assessed by using the NIH Toolbox and Child Behavioral Checklist, respectively. Brain structure was evaluated by the cortical thickness, area, and volume extracted from the magnetic resonance imaging (MRI) data. Subgroup analyses were conducted by prematurity, birth weight, with sibling, genetic profiles, and twin types (zygosity). From 1st September 2016 to 15th November 2018, 11545 children (9477 singletons and 2068 twins) aged 9-10 years were enrolled. Twins showed mildly lower cognitive performance (|t|> 5.104, P-values < 0.001, False Discovery Rate [FDR] < 0.001), better behavioral outcome (|t|> 2.441, P-values < 0.015, FDR < 0.042), such as lower scores for multiple psychiatric disorders and behavioral issues, and smaller cortical volume (t = - 3.854, P-values < 0.001, FDR < 0.001) and cortical area (t = - 3.872, P-values < 0.001, FDR < 0.001). The observed differences still held when stratified for prematurity, birth weight, presence of siblings, genetic profiles, and twin types (zygosity). Furthermore, analyses on the two-year follow-up data showed consistent results with baseline data. Twin status is associated with lower cognitive and better behavioral development in early adolescence accompanied by altered brain structure. Clinicians should be aware of the possible difference when generalizing results from adolescent twin samples to singletons.

We investigated the development of children\'s self-reported positive (Companionship and Recreation, Validation and Caring, Help and Guidance, Intimate Disclosure, and Conflict Resolution) and negative (Conflict and Betrayal) friendship quality from the third to sixth grades using The National Institute of Child Health and Development (NICHD) Study of Early Child Care and Youth Development data (NICHD SECCYD; n = 1,364; M age = 9.03 years; 51.70% boys at recruitment). Consistent with expectations, growth models suggested that children reported higher positive, and lower negative, friendship quality with age. Boys had significantly lower positive friendship quality at third grade and slower increases than girls. Boys had slower decreases in negative friendship quality than girls. It is possible that different social orientations explain sex differences in friendship quality trajectories. Further research is needed to explore other factors that might account for individual differences in friendship quality trajectories.

OBJECTIVE: Sleep is essential to adolescent development. Sexual and gender minority (SGM; e.g., lesbian, gay, bisexual, transgender) adults are at high risk for poor sleep, partially due to minority stress (e.g., discrimination). However, sleep has rarely been studied among SGM adolescents. In a national sample of early adolescents, we analyzed sexual minority (SM) and gender minority (GM) identity, gender incongruence, and gender nonconformity in association with sleep and tested minority and general stressors as mediators.
METHODS: We cross-sectionally analyzed data from 10,070 adolescents aged 10-14 in the Adolescent Brain Cognitive Development℠ Study. Using logistic regression models, we analyzed associations between identity (SM and GM), sexual identity discrimination, minority and general stressors (sexual identity discrimination, teasing, and conflict with parents) and sleep health (duration, latency, and disturbance). We used Baron and Kenny\'s method to test for mediation.
RESULTS: Participants reported sexual identity (4% SM, 4% questioning) and gender identity (0.4% GM, 0.6% questioning); 65% were White, 20% were Hispanic, and 52% were assigned male at birth. Compared to heterosexual, SM participants had higher odds of short sleep duration, long sleep latency, and sleep disturbance. GM participants and those reporting gender incongruence and nonconformity had higher odds of long sleep latency and sleep disturbance. Sexual identity discrimination and general social stressors partially mediated some associations.
CONCLUSIONS: SGM participants reported poorer sleep. Minority and general social stressors partially accounted for some disparities. Policies need to address SGM identity-based discrimination and challenge social norms that produce minority stress for SGM early adolescents.

The human brain undergoes structural development from childhood to adolescence, with specific regions in the sensorimotor, social, and affective networks continuing to grow into adulthood. While genetic and environmental factors contribute to individual differences in these brain trajectories, the extent remains understudied. Our longitudinal study, utilizing up to three biennial MRI scans (n=485), aimed to assess the genetic and environmental effects on brain structure (age 7) and development (ages 7-14) in these regions. Heritability estimates varied across brain regions, with all regions showing genetic influence (ranging from 18 % to 59 %) with additional shared environmental factors affecting the primary motor cortex (30 %), somatosensory cortex (35 %), DLPFC (5 %), TPJ (17 %), STS (17 %), precuneus (10 %), hippocampus (22 %), amygdala (5 %), and nucleus accumbens (10 %). Surface area was more genetically driven (38 %) than cortical thickness (14 %). Longitudinal brain changes were primarily driven by genetics (ranging from 1 % to 29 %), though shared environment factors (additionally) influenced the somatosensory cortex (11 %), DLPFC (7 %), cerebellum (28 %), TPJ (16 %), STS (20 %), and hippocampus (17 %). These findings highlight the importance of further investigating brain-behavior associations and the influence of enriched and deprived environments from childhood to adolescence. Ultimately, our study can provide insights for interventions aimed at supporting children\'s development.