Early-life family and school impacts on adolescent conduct problems: A path analysis.

Limited research has been conducted to examine the factors during early childhood that may contribute to conduct problems in later stages of life. This study aimed to investigate the relationship between family and school environments during early childhood and conduct problems in adolescence. In Wave 1 (W1), the study recruited 502 participants, aged 5-6 years, from Hong Kong local kindergartens, with 51.4% boys. One of their parents provided information about family socioeconomic status (SES), parent-child recreational activities, and child screen time, whereas the class teacher rated their school readiness using the Chinese version of the Early Development Instrument. Data on the number of special facilities were obtained from the kindergartens. In Wave 2 (W2), the same parents of 395 participants were asked about their involvement in their children's education. Finally, in Wave 3 (W3), the parents of 206 participants completed the Conduct Problem scale of the Strength and Difficulties Questionnaire to evaluate the level of conduct problems in the participants. The results of the path analysis revealed that higher W1 family SES was associated with fewer W3 conduct problems through an increase in W1 and W2 parental involvement in children's learning and play activities. Findings have implications for understanding the impact of early-life family and school environments on adolescent conduct problems. Early childhood interventions that promote family resources and positive parent-child interactions have the potential to reduce adolescent conduct problems.

Longitudinal associations between child discipline methods and physical growth patterns across preschool years.

OBJECTIVE: Research has documented the associations of child maltreatment with a range of physical health problems, but little is known about the physical growth patterns of children who experience maltreatment in early childhood. This study aimed to examine the association between various discipline approaches and physical growth in preschool-aged children. METHODS: In the first year of preschool, parents of 661 Chinese preschool-aged children completed a questionnaire with items pertaining to the frequency of using physical maltreatment, psychological aggression, neglect, and nonviolent discipline toward the child. Children's weight and height were assessed annually using direct assessment in the first and two subsequent years. Longitudinal analyses were performed using multiple regression models. RESULTS: More frequent neglect and psychological aggression during the first year of preschool were associated with a higher likelihood of a decreased BMI z score in subsequent years. Conversely, increased experience of physical maltreatment in the first year was associated with an increased likelihood of having overweight or obesity in the third year. CONCLUSIONS: Results indicate that early maltreatment experience can impact physical growth. This highlights the importance of preventing abusive parenting and encouraging healthy habits in young children who have experienced maltreatment to decrease their future risk for weight problems.

Workforce preparation for delivery of nurturing care in low- and middle-income countries: Expert consensus on critical multisectoral training needs.

BACKGROUND: Services to support nurturing care through early childhood development (ECD) in low- and middle-income countries are hampered by significant workforce challenges. The global early childhood workforce is both diverse and complex, and it supports the delivery of a wide range of services in extremely diverse geographical and social settings. In the context of contemporary global goals for the universal provision of quality early childhood provision, there is an urgent need to build appropriate platforms for strengthening and supporting this workforce. However, the evidence base to support this work is severely limited. METHODS: To contribute to evidence on how to strengthen the ECD workforce in low- and middle-income countries, this study used a Delphi methodology involving three rounds of data collection with 14 global experts, to reach consensus on the most critical training needs of three key early childhood workforce groups: (i) health; (ii) community-based paraprofessionals, and (iii) educational professionals working across ECD programmes. RESULTS: The study identified a comprehensive set of shared, as well as distinct, training needs across the three groups. Shared training needs include the following: (i) nurturing dispositions that facilitate work with children and families in complex settings; (ii) knowledge and skills to support responsive, adaptable delivery of ECD programmes; and (iii) systems for ECD training and professional pathways that prioritise ongoing mentoring and support. CONCLUSIONS: The study's detailed findings help to address a critical gap in the evidence on training needs for ECD workers in low-resource contexts. They provide insights into how to strengthen content, systems, and methods of training to support intersectoral ECD work in resource-constrained contexts.

Digital Technology Use and Adolescent Mental Health Before and During the COVID-19 Pandemic: The Roles of Internet Addiction and Digital Competence.

This study examined whether Internet addiction (IA) and digital competence (DC) mediated the association between digital technology use and mental health problems in adolescents before and during the COVID-19 pandemic, when digital device use increased dramatically. Repeated cross-sectional data from a 3-year cross-cohort study adopting stratified random sampling were analyzed. In 2019, 569 adolescents (female = 312) from 14 secondary schools completed a DC assessment and an online survey on their digital technology use, IA, and mental health. In 2021, 775 adolescents (female = 397) from 11 of those 14 schools completed both instruments. Results showed that adolescents in 2021 spent more time using digital devices, were more digitally competent, and reported more mental health problems than adolescents in 2019. The prevalence of IA was 8 percent in 2019 and 12.4 percent in 2021. In both years, more frequent digital technology use predicted a higher risk of IA, which was associated with more mental health problems (indirect ß = 0.08, p < 0.001 for 2019 and ß = 0.05, p < 0.001 for 2021). In addition, in 2021, DC was positively associated with digital technology use and negatively with IA, which indirectly related to fewer mental health problems (indirect ß = -0.01, p = 0.03). In conclusion, DC is a protective factor alleviating the positive associations of digital technology use and IA with mental health problems in adolescents when the ecological context requires high levels of digital device use.

Promoting Equity in Access to Quality Early Childhood Education in China.

This paper reviews the Chinese government's efforts and progress towards ensuring equitable access to quality early childhood education (ECE). It begins with an overview of the Chinese context and analysing the reasons for a policy focus on ECE in recent decades. Thereafter, from a historical perspective, it critically reviews policies pertaining to enhancing access to and the quality of ECE in China since 2010. Nationally representative data are used to document policy implementation. Our analyses of national policies and representative data suggest that the state considers ECE a public good. This is evident from policy changes, efforts to bridge urban-rural disparities, fiscal allocations to the most economically disadvantaged groups, and strategies to enhance the quality of ECE.A significant focus on policy implementation with improved regulation and monitoring of services provided by both state and non-state actors was found. However, it is evident that gaps persist between urban and rural areas regarding infrastructure and resourcing, gross enrolment rates, and teacher-child ratios. That stated, the momentum that has driven policy change and the dramatic gains demonstrates the priority accorded to ECE.

Associations between parental well-being and early learning at home before and during the COVID-19 pandemic: observations from the China Family Panel Studies.

Background: COVID-19-related lockdowns and preschool closures resulted in many young children spending all their time at home. Some parents had to manage child care while working from home, and increased demands may have led them to experience considerable stress. Evidence indicates that among parents with young children, those who had pre-existing mental and physical conditions adapted less well than other parents. We considered associations between parental well-being and the home learning environment for young children. Method: We leveraged data from the nationally representative China Family Panel Studies. We analyzed longitudinal data collected before (2018) and during (2020) the pandemic. Participants were parents of 1,155 preschoolers (aged 3-5 years in 2020). Moderated mediation models were conducted. Maternal and paternal psychological well-being, depression, physical health, and physical illness in 2018 and 2020 were predictors. The frequency of marital and intergenerational conflicts in 2020 were mediators. Primary caregiver-reported engagement in home learning activities and family educational expenditure and parent-reported time spent on child care in 2020 were outcome variables. The number of COVID-19 cases in each province 3 months before the 2020 assessment was the moderator. Child, parental, and household characteristics and urbanicity were covariates. Results: Controlling for covariates, improvements in parental psychological well-being predicted more home learning activities and increases in paternal depression predicted less time spent by fathers on child care. Negative changes in maternal physical health predicted less family educational expenditure and mothers spending more time on child care. Family conflicts mediated the association between maternal physical illness in 2018 and family educational expenditure. The number of COVID-19 cases in a province (i) was positively associated with mothers spending more time on child care, (ii) moderated the association of improvements in maternal physical health and mothers spending less time on child care, and (iii) moderated the association of family conflicts and more family educational expenditure. Conclusion: The findings indicate that decreased parental psychological and physical well-being foretells reductions in monetary and non-monetary investment in early learning and care at home. Regional pandemic risk undermines maternal investment in early learning and care, especially for those with pre-existing physical conditions.

Global tracking of access and quality in early childhood care and education.

Investments in early childhood care and education (ECCE) have contributed to a growing demand for internationally comparable data. Yet data on access to quality ECCE are not routinely collected in many countries, leading to limited information on equitable access to ECCE, quality of provision, and the impact on learning and wellbeing outcomes. This paper outlines the current status of global measurement of access to quality ECCE and identifies issues with definitions, availability, and accuracy of ECCE data across countries and outlines paths forward. We argue that estimates of access to ECCE should be based on children's participation in quality ECCE across multiple program types, rather than enrollment or attendance alone, given the critical importance of dosage and participation for ensuring positive benefits from ECCE. Governments, international organizations, and researchers all have roles to play in setting standards to define and monitor ECCE, generating workable tools for measuring nationally, and globally investing in national monitoring systems and routine household surveys to obtain accurate estimates of access to quality ECCE.

Family play, reading, and other stimulation and early childhood development in five low-and-middle-income countries.

This paper used longitudinal data from five studies conducted in Bangladesh, Bhutan, Cambodia, Ethiopia, and Rwanda to examine the links between family stimulation and early childhood development outcomes (N = 4904; Mage = 51.5; 49% girls). Results from random-effects and more conservative child-fixed effects models indicate that across these studies, family stimulation, measured by caregivers' engagement in nine activities (e.g., reading, playing, singing), predicted increments in children's early numeracy, literacy, social-emotional, motor, and executive function skills (standardized associations ranged from 0.05 to 0.11 SD). Study-specific models showed variability in the estimates, with null associations in two out of the five studies. These findings indicate the need for additional research on culturally specific ways in which caregivers may support early development and highlight the importance of promoting family stimulation to catalyze positive developmental trajectories in global contexts. RESEARCH HIGHLIGHTS: Research on the links between family stimulation and early childhood development in low-and-middle-income countries (LMICs) is limited. We used longitudinal data from studies conducted in five LMICs to examine the links between family stimulation and early childhood development outcomes. Results suggest that family stimulation predicted increments in children's numeracy, literacy, social-emotional, motor, and executive function skills. We found variability in the observed estimates, with null associations in two out of the five studies, suggesting the need for additional research in LMICs.

Preschool experiences and home learning environments of migrant children in urban China.

Internal migration and urban expansion, hallmarks of rapid urbanization in China, have led to an increasing number of children with diverse backgrounds in cities. Cities now include migrants from rural and urban areas, and children from "urban villages" in addition to "urban locals". Parents of young children who migrate from rural to urban areas leave their children behind in rural areas ("left-behind" children) or take them along with them. In recent years, increasing parental migration from one urban area to another has also led to children being "left-behind" in urban areas. This study examined the preschool experiences and home learning environments of rural-origin migrants, urban-origin migrants, and rural-origin locals in comparison to urban locals, leveraging data from the nationally representative China Family Panel Studies (2012-2018) with 2,446 3- to 5-year-olds residing in urban areas. Regression model results indicated that children living in cities who held a rural household registration certificate (hukou) were less likely to attend publically funded preschools and experienced less stimulating home learning environments than urban local children. After controlling for family characteristics (i) rural-origin locals remained less likely to participate in preschool and experienced fewer home learning activities than urban locals; and (ii) there were no differences in preschool experiences and home learning environments between rural-origin migrants and urban locals. Mediation analyses suggested that the relation between hukou status and the home learning environment was mediated by parental absence. Implications of the findings are discussed.

Reliability and Validity of the East Asia-Pacific Early Child Development Scales: A Longitudinal Validation Study in China.

This study examined the test-retest reliability and predictive validity of the East Asia-Pacific Early Child Development Scales (EAP-ECDS) Short Form. In China, preschools typically provide children with educational activities in age-segregated classrooms - Kindergarten Level 1 (K1) (3 to 4 years), Kindergarten Level 2 (K2) (4 to 5 years), and Kindergarten Level 3 (K3) (5 to 6 years). A total of 709 children in K2 (Mage = 57.85 months, SD = 4.77) were randomly selected from 29 kindergartens in Shanghai municipality and Guizhou province of China. Children were assessed using the EAP-ECDS in K2 and K3. School readiness was assessed in K3, and literacy and mathematics achievement were assessed in Grade 2. Pearson's correlation coefficient and intraclass correlation coefficient (ICC = 0.73) indicated that the tool had good test-retest reliability across K2 and K3. Regarding predictive validity, K2 EAP-ECDS predicted K3 school readiness (ß = 0.26), Grade 2 language and literacy (ß = 0.18) and mathematics (ß = 0.22) after adjusting for age, gender, socioeconomic status, and region. Findings support using the tool to measure the holistic development of preschool-aged children in China and the region.

Hygiene Practices and Early Childhood Development in the East Asia-Pacific Region: A Cross-Sectional Analysis.

Poor hygiene might be a risk factor for early childhood development (ECD). This study investigated the associations of three hygiene practices ('wash hands before a meal,' 'wash hands after going to the toilet,' and 'brush teeth'), separately and combined, with ECD. Six thousand six hundred ninety-seven children (4 [0.8] years) from the East Asia-Pacific Early Child Development Scales validation study were included in this cross-sectional analysis. The hygiene variables were recoded to have comparable values as 'always,' 'sometimes,' and 'never.' These variables were then grouped to create combined categories. The binary outcome variables, poor ECD, were defined as a score < age-specific 25th centile. Modified Poisson regression models were used to analyse the associations. Data collection was performed between 2012 and 2014, and the analyses were conducted in April 2022. Compared with children who 'always' washed their hands before a meal, those who did it 'sometimes' (Prevalence Ratio [PR]: 1.30 [95% CI: 1.16-1.46]) or 'never' (PR: 1.35 [1.18-1.55]) had a higher likelihood of poorer overall development. Comparable results were identified for the other two hygiene practices and the other four domain-specific outcomes (p < 0.05). Compared with children who always followed the three hygiene practices, the likelihood of poor overall ECD increased as the combined hygiene practice decreased among children with poor hygiene practices (PRnever: 1.67 [1.40-2.00]; PRrarely: 1.49 [1.30-1.71]; PRsometimes: 1.30 [1.14-1.49]). Children who did not always follow good hygiene practices had a higher likelihood of poor ECD independently of sociodemographic factors. Considering these findings, future hygiene practice interventions and trials should consider including ECD outcomes.

Role of osteopontin in oral epithelial dysplasia, oral submucous fibrosis and oral squamous cell carcinoma.

Background: Inflammatory cells and cytokines in the chronically injured mucosa promote fibrosis in the oral submucous fibrosis (OSF) fibrotic milieu. Osteopontin (OPN) is a wound-healing mediator that upregulates the inflammatory response and is involved in the malignancy and fibrosis of multiple organ systems. Objectives: We investigated the expression of OPN in oral potentially malignant disorders (OPMDs) and oral squamous cell carcinomas (OSCCs) to determine its role in the malignant transformation and fibrosis of oral tissues. The expression of OPN in OPMDs and OSCCs was compared and correlated, and the role of OPN as a fibrotic mediator in OSF was explained. Study Design: A total of 30 cases of normal mucosa and OPMDs (mild dysplasia, severe dysplasia, OSF and OSCCs) were studied by purposive sampling. In these groups, OPN immunoreactivity was examined and correlated with clinical findings. Results: In mild dysplasia, OPN expression was restricted to the basal cell layer with moderate staining intensity. In severe dysplasia, it was extremely intense and extended throughout the epithelium. In the OSF, OPN expression was moderate in the perinuclear areas of the basal cell layer. The expression of OPN was very strong in OSCC. A flow diagram explaining the profibrotic role of OPN in OSF has been provided. Conclusion: A positive role of OPN in both pathogenesis and malignant transformation of OPMDs and OSCC has been demonstrated.

Trends in the prevalence and social determinants of stunting in India, 2005-2021: findings from three rounds of the National Family Health Survey.

Objectives: To assess social determinants of stunting and the shifts in contributions of socio-demographic factors to national prevalence trends in India between 2005 and 2021. Methods: We leveraged data from three rounds of the National Family Health Survey (NFHS-3: 2005-2006, NFHS-4: 2015-2016, NFHS-5: 2019-2021) for 443 038 children under 5 years. Adjusted logistic regression models and a Kitigawa-Oaxaca-Blinder decomposition were deployed to examine how wealth, residence, belonging to a marginalised social group, maternal education and child sex contributed to changes in stunting prevalence. Results: The decrease in stunting prevalence was notably slower between NFHS-4 and NFHS-5 (annual average rate of reduction (AARR): 1.33%) than between NFHS-3 and NFHS-4 (AARR: 2.20%). The protective effect of high wealth diminished from 2015 onwards but persisted for high maternal education. However, an intersection of higher household wealth and maternal education mitigated stunting to a greater extent than either factor in isolation. Residence only predicted stunting in 2005-2006 with an urban disadvantage (adjusted OR: 1.18; 95% CI: 1.07 to 1.29). Children from marginalised social groups displayed increased likelihoods of stunting, from 6-16% in 2005-2006 to 11-21% in 2015-2016 and 2020-2021. Being male was associated with 6% and 7% increased odds of stunting in 2015-2016 and 2019-2021, respectively. Increased household wealth (45%) and maternal education (14%) contributed to decreased stunting prevalence between 2005 and 2021. Conclusions: Stunting prevalence in India has decreased across social groups. However, social disparities in stunting persist and are exacerbated by intersections of low household wealth, maternal education and being from a marginalised social group. Increased survival must be accompanied by needs-based interventions to support children and mitigate mutually reinforcing sources of inequality.

Digital competence as a protective factor against gaming addiction in children and adolescents: A cross-sectional study in Hong Kong.

Background: Digital competence can help children and adolescents engage with technology for acquiring new knowledge and for broadening social contact and support, while reducing the risk of inappropriate media use. This study investigated the effects of digital competence on the risk of gaming addiction among children and adolescents. We explored whether students with good digital competence were protected from the adverse effects of media use and the risk of gaming addiction. Methods: 1956 students (690 primary and 1266 secondary) completed a digital competence assessment and a self-report questionnaire on their mental health status, use of digital devices, and experiences of cyberbullying. Multiple regression analyses with further mediation and moderation analyses were performed to investigate the association of digital competence with gaming addiction and mental health in children and adolescents. Findings: Regression analyses showed that children and adolescents with better digital competence were less likely to develop gaming addiction (ß = -0.144, p < 0.0001) and experienced less cyberbullying behaviour as perpetrators (ß = -0.169, p < 0.0001) and as victims (ß = -0.121, p < 0.0001). Digital competence was found to mediate the relationship between digital device usage time and gaming addiction. Interpretation: Digital competence is associated with less gaming addiction and could potentially lead to better mental wellbeing by reducing the risks of gaming addiction and cyberbullying. Education that promotes digital competence is essential to maximize the benefits of media use, while reducing the potential adverse effects from the inappropriate use of digital devices. Funding: This study was supported by a grant from the Research Grants Council of the HKSAR Government (#T44-707/16N) under the Theme-based Research Scheme.

Digital Technology Use and Cyberbullying Among Primary School Children: Digital Literacy and Parental Mediation as Moderators.

Cyberbullying has become a critical issue in many parts of the world. Children affected by bullying in cyberspace may also experience various other problems in their daily lives, such as emotional and behavioral issues. Despite the well-documented positive correlation between digital technology use and cyberbullying experiences in adolescents, a paucity of research has explored the association between digital technology use and cyberbullying, and the extent to which digital literacy (DL) and parental mediation moderate these relationships among primary school-aged children. This study addressed these research gaps. A total of 736 children (third grade, female = 52 percent) in Hong Kong, selected through stratified random sampling, reported on their digital technology use, parental mediation of technology use (i.e., active mediation and restriction), and cyberbullying experiences. A performance-based assessment measured children's DL. Results showed a positive association between children's digital technology use (both for leisure activities and for schoolwork) and cyberbullying experiences (both as perpetrator and victim). These positive associations were more pronounced among children with low levels of DL (only victims) as well as among children with highly restrictive parents (both perpetrators and victims). Implications for digital citizenship education and parental intervention are discussed.

Using Latent Class Analyses to Examine Health Disparities among Young Children in Socially Disadvantaged Families during the COVID-19 Pandemic.

Rising income inequality is strongly linked to health disparities, particularly in regions where uneven distribution of wealth and income has long been a concern. Despite emerging evidence of COVID-19-related health inequalities for adults, limited evidence is available for children and their parents. This study aimed to explore subtypes of families of preschoolers living in the disadvantaged neighborhoods of Hong Kong based on patterns of family hardship and to compare their patterns of parenting behavior, lifestyle practices, and wellbeing during the COVID-19 pandemic. Data were collected from 1338 preschoolers and their parents during March to June 2020. Latent class analysis was performed based on 11 socioeconomic and disease indicators. Multivariate logistic regressions were used to examine associations between identified classes and variables of interest during the COVID-19 pandemic. Four classes of family hardship were identified. Class 1 (45.7%) had the lowest disease and financial burden. Class 2 (14.0%) had the highest financial burden. Class 3 (5.9%) had the highest disease burden. Class 4 (34.5%) had low family income but did not receive government welfare assistance. Class 1 (low hardship) had lower risks of child maltreatment and adjustment problems than Class 2 (poverty) and Class 3 (poor health). However, children in Class 1 (low hardship) had higher odds of suffering psychological aggression and poorer physical wellbeing than those in Class 4 (low income), even after adjusting for child age and gender. The findings emphasize the need to adopt flexible intervention strategies in the time of large disease outbreak to address diverse problems and concerns among socially disadvantaged families.

Effectiveness of a Multicomponent Parenting Intervention for Promoting Social-Emotional School Readiness Among Children From Low-Income Families in Hong Kong: A Cluster Randomized Clinical Trial.

IMPORTANCE: Most parenting programs target parents of children with severe behavioral problems. There is limited evidence on the effectiveness of universal parenting programs, especially for families with low income. OBJECTIVE: To evaluate the effectiveness of the KeySteps@JC Parent-Child Interaction Program for low-income families in Hong Kong. DESIGN, SETTING, AND PARTICIPANTS: A parallel, unblinded, cluster, randomized clinical trial was conducted from September 2018 to June 2019. Eight participating preschools in Hong Kong were randomly assigned (1:1) using an online randomization plan generator into intervention (immediate) and waiting list control (delayed) groups. Intervention participants included the parents of children in kindergarten grade 1. The results were processed by an intention-to-treat analysis. INTERVENTIONS: KeySteps@JC Parent-Child Interaction program. MAIN OUTCOMES AND MEASURES: The primary outcome was child behavioral problems, which were assessed using the Strength and Difficulties Questionnaire. Secondary outcomes were parental emotion coaching, involvement in child reading and play, and parent stress levels, which were assessed using Chinese-validated versions of the Parent Reading Belief Inventory, the Chinese Parent-Child Interaction Scale, the Emotion-Related Parenting Styles, and the Parental Stress Scale questionnaires. Parents in the intervention group participated in a training program consisting of 20 weekly 1.5-hour sessions on child behavior management, emotion coaching, dialogic reading, and interactive play. The primary hypothesis was that child behavior problems would be reduced after the intervention. The main analysis was a mixed-method regression with group status as the independent variable. RESULTS: A total of 267 parents (mean age, intervention group: 33.8 years; 95% CI, 32.9-34.7 years; waiting list group: 35.7 years; 95% CI, 34.5-36.9 years) participated in the program. The intervention group included 153 participants (57.3%), and the waiting list group included 114 participants (42.7%). Among the target children (mean age, intervention group: 3.5 years; 95% CI, 3.4-3.5 years; waiting list group: 3.4 years; 95% CI, 3.4-3.5 years), there were 88 boys (57.5%) in the intervention group and 59 boys (51.8%) in the waiting list group. At postintervention, the intervention group reported a statistically significant improvement in children's behavior (Cohen d, 0.29; 95% CI, 0.04-0.53); parents' use of emotion-coaching strategies, including feelings of uncertainty or ineffectiveness in emotion socialization (Cohen d, 0.26; 95% CI, 0.01-0.50) and parental rejection of negative emotion (Cohen d, 0.33; 95% CI, 0.08-0.57); and involvement in child reading (Cohen d, 0.17; 95% CI, -0.07 to 0.41). CONCLUSIONS AND RELEVANCE: The results of this randomized clinical trial provide promising evidence on the effectiveness of a multicomponent parenting intervention in preparing children from low-income families to be more socially and emotionally ready for school. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT03615937.

Weight-for-Height, Body Fat, and Development in Children in the East Asia and Pacific Region.

Importance: Weight-for-height z score (WHZ) is a standard indicator of children's nutritional status even though it does not fully reflect body fat. Objective: To examine the combined association of WHZ and body fat with early development in the East Asia and Pacific region. Design, Setting, and Participants: Children from the East Asia-Pacific Early Child Development Scales validation study, with full data available regarding their nutritional status and outcomes, were included in this cross-sectional analysis. In brief, a multilevel stratified random sampling was used to select representative samples from each participating country in the study. WHZ and body fat were independently trichotomized using established references and were combined to form a 9-category exposure variable. Data collection was performed between 2012 and 2014, and the analyses were conducted in June 2021. Main Outcomes and Measures: The binary outcome variable of not being developmentally on track (hereafter referred to as poor development) was defined as a score less than the 25th percentile in the following domains: cognitive, language, socioemotional, motor development, and total development score. Poisson regression models were used to analyze the associations between the combined categories and poor development, adjusted for sociodemographic factors. Results: A total of 6815 children (mean [SD] age, 4.02 [0.8] years; 3434 girls [50.4%]) had full data available and were included in this study. Compared with children with normal weight and normal fat, those with wasting and low body fat had the highest likelihood of total poor development (prevalence ratio, 1.47; 95% CI, 1.28-1.70), followed by those with normal weight but low fat (prevalence ratio, 1.23; 95% CI, 1.11-1.36). Similar associations were found in language, cognitive, and socioemotional development, but not in motor development. Conclusions and Relevance: Poor development was more commonly found in children with low body fat independent of WHZ (wasted or normal weight). Early public health strategies may consider using a combination of WHZ and body fat as an indicator of poor development.

Mental health & maltreatment risk of children with special educational needs during COVID-19.

BACKGROUND: Children with special educational needs (SEN) are more vulnerable during the COVID-19 pandemic with risk of poor mental wellbeing and child maltreatment. OBJECTIVE: To examine the impact of COVID-19 on the mental health of children with SEN and their maltreatment risk. PARTICIPANTS AND SETTING: 417 children with SEN studying at special schools and 25,427 children with typical development (TD) studying at mainstream schools completed an online survey in April 2020 in Hong Kong during school closures due to COVID-19. METHOD: Emotional/behavioural difficulties, quality of life and parental stress of children with SEN were compared with typically developed children using mixed effect model. Linear regression analyses were performed to explore factors associated with child emotional/behavioural difficulties and parental stress during the pandemic. Chi-square test was performed to detect the differences in maltreatment risk before and during COVID-19. RESULTS: Children with SEN had significantly poorer overall quality of life (68.05 vs 80.65, p < 0.01). 23.5% of children had at least one episode of severe physical assault and 1.9% experienced very severe physical assault during COVID-19. Rates of physical assault increased significantly (59.8% vs. 71.2% p < 0.001) while children with mental disorders had increased risk of severe physical assault comparing to those without mental disorders (RR = 1.58, ꭓ2 = 5.19 p = 0.023). CONCLUSION: Children with SEN had poorer mental health than typically developed children during the COVID-19 pandemic. Maltreatment risk for children with SEN is higher in comparison to pre-COVID-19 era. Surveillance of child maltreatment, continuity of medical and rehabilitation care to support children with SEN are essential during a disease pandemic.

Early-life activities mediate the association between family socioeconomic status in early childhood and physical fitness in early adolescence.

The graded association between family socioeconomic status (SES) and physical fitness is evident, but little is known about the mechanism underlying this association. This study investigated the role of early-life activities as mediators of the longitudinal relationship between early-life SES and health-related physical fitness in 168 adolescents (51.2% boys; final mean age: 12.4 years old). In Wave 1 (2011-12), their parents completed questionnaires about family socioeconomic status (SES), parent-child activities, and child screen time. In Wave 2 (2014-15), participants' physical activity levels were assessed through parent proxy-reports. In Wave 3 (2018-19), a direct assessment of handgrip strength, standing long-jump, and 6-min walk test (6MWT) performance was conducted. After controlling for demographic factors, results of mediation analyses revealed that (a) Wave 1 SES predicted Wave 3 long-jump and 6MWT performance; (b) child physical activity level in Wave 2 mediated the relation between Wave 1 SES and standing long-jump performance in Wave 3; and (c) recreational parent-child activities and child screen time in wave 1 mediated the relation between Wave 1 SES and 6MWT performance in Wave 3. Our findings suggest that the type and frequency of early-life activities play a role in the graded association between childhood SES and physical fitness in adolescence.