Longitudinal Relationship Research Articles

School connectedness as a protective factor between childhood adversity and adolescent mental health outcomes.

School connectedness may offset mental health risks associated with childhood adversity. The present study examined the potential protective effects of school connectedness against childhood adversity when predicting adolescent mental health outcomes in 9,964 individuals (51% female, 81% white) from the Millennium Cohort Study. Structural equation models were fitted to examine the longitudinal relationships between childhood adversity, school connectedness, and adolescent mental health. Childhood adversity was a risk factor, predicting greater internalizing and externalizing problems and lower levels of positive mental health. School connectedness was a promotive factor as it predicted fewer mental health problems and greater positive mental health. Furthermore, school connectedness at age 11 was protective against childhood adversity when predicting internalizing and externalizing problems at age 14. That is, students with a history of adversity who felt more connected to school were less likely to exhibit internalizing and externalizing symptoms than those who felt less connected to school. Only school connectedness at age 11 was protective against childhood adversity, indicating that feeling connected to school at younger ages may disrupt processes linking childhood adversity to adolescent mental health. Schools should foster students' feelings of connectedness to protect vulnerable individuals and benefit all pupils' mental health.

Association of ambient ozone exposure with early cardiovascular damage among general urban adults: A repeated-measures cohort study in China

Longitudinal evidence of long-term ozone exposure on heart rate variability (HRV, an early indicator of cardiovascular damage) is lacking and the potential mechanism remains largely unclear. Our objectives were to evaluate the cross-sectional and longitudinal associations of ozone exposure with HRV alteration, and the potential roles of protein carbonyl (PC, biomarker of oxidative protein damage) and transforming growth factor (TGF)-β1 in this association. This repeated-measures prospective study included 4138 participants with 6617 observations from the Wuhan-Zhuhai cohort. Ozone concentrations were estimated using a high temporospatial resolution model for each participant. HRV indices, PC, and TGF-β1 were also repeatedly measured. Cross-sectional and longitudinal relationships of ozone exposure with HRV alteration were evaluated by linear mixed model. Cross-sectionally, the strongest lag effect of each 10 ppb increment in short-term ozone exposure showed a 12.40 %, 8.47 %, 4.31 %, 8.03 %, 3.69 %, and 2.41 % decrement on very low frequency (VLF, lag 3 weeks), LF (lag 2 weeks), high frequency (HF, lag 0–7 days), total power (TP, lag 2 weeks), standard deviation of all normal-to-normal intervals (SDNN, lag 3 weeks), and square root of the mean squared difference between adjacent normal-to-normal intervals (lag 2 weeks), respectively. Longitudinally, each 10 ppb increment of annual average ozone was related with an annual change rate of −0.024 ms2/year in VLF, −0.009 ms2/year in LF, −0.013 ms2/year in HF, −0.014 ms2/year in TP, and −0.004 ms/year in SDNN. Mediation analyses indicated that PC mediated 20.77 % and 12.18 % of ozone-associated VLF and TP decline, respectively; TGF-β1 mediated 16.87 % and 27.78 % of ozone-associated VLF and SDNN reduction, respectively. Our study demonstrated that ozone exposure was cross-sectionally and longitudinally related with HRV decline in general Chinese urban adults, and oxidative protein damage and increased TGF-β1 partly mediated ozone exposure-related HRV reduction.

Longitudinal association of stress with mental health in the context of COVID-19: The mediating role of psychological flexibility and emotional schemas.

Stress is a known contributor to psychosocial pathological conditions and reduction of well-being. The literature has highlighted the role of emotional schemas and psychological flexibility as psychological processes underlying this relationship in the short term. This two-wave longitudinal study analyses the mediating role of psychological flexibility and emotional schemas in the relationship between stress responses to COVID-19-related events and mental health 6 months later. Two hundred and seventy-six individuals were included in this study, completing measures of stress responses, emotional schemas, psychological flexibility and positive and negative mental health. Negative evaluation of emotions was a significant mediator in the longitudinal relationship between stress responses and negative mental health. Valued action and openness to experience mediate the longitudinal relationship between stress responses and positive mental health. This study underscores the importance of the different dimensions of psychological processes, suggesting that over time, more maladaptive psychological processes play a significant role in elucidating the relationship between stress responses and negative mental health. Similarly, it suggests that more adaptive processes may help explain the relationship between stress responses and positive mental health. This contributes to a better understanding of the stability of these processes, which is important for determining which intervention targets should be prioritised.

Longitudinal relationship between adolescent emotional self-regulation and prosocial behavior toward powerful people: Disentangling between-person differences from within-person effects.

This study investigated the longitudinal effects between adolescent emotional self-regulation and prosocial behavior toward powerful people (i.e., actions aimed at benefiting or supporting individuals who hold significant influence or authority within a group or society), based on the perspective of positive socialization cycle. We recruited 543 Chinese adolescents (284 girls, M age at Time 1 = 11.27 years) and collected three waves of data over 3 years, each approximately 1 year apart (n Time 2 = 449, n Time 3 = 417). Traditional cross-lagged panel model was conducted to test the longitudinal relationship between emotional self-regulation and prosocial behavior toward powerful people. Then, a random-intercept cross-lagged panel model was performed to disentangle the between-person differences from the within-person predictive processes. The results showed that, emotional self-regulation in the previous year was positively associated with prosocial behavior toward powerful people in the next year, whereas earlier prosocial behavior toward powerful people was not predictive of subsequent emotional self-regulation. Findings advocate the domain-specific nature of self-regulation and prosocial behavior and deepen our understanding of the relationship between the two from the culture-specific perspective. This study also highlights the value of emotional self-regulation intervention as a viable way to promote adolescent prosocial development. Theoretical and empirical implications are discussed.

Longitudinal Relationships among Parenting, Prosocial Behaviors, and Emotional Problems: Examining Between- and Within-Person Associations in Adolescents.

Although bidirectional associations between parenting and adolescents' social and emotional outcomes have been investigated, how parental warmth and harsh parenting as two different parenting dimensions, adolescents' prosocial behaviors, and emotional problems were longitudinally and bidirectionally related at between- and within-person levels remains unclear. With a three-wave longitudinal design, the present study examined these associations by employing the random-intercept cross-lagged panel model. Data from 606 Chinese adolescents (Mage = 13.80 years, SD = 0.52, at T1; 45.7% girls) were collected at six-month intervals over one year, and participants completed questionnaires assessing their perception of parenting, prosocial behaviors, and emotional problems online. The results indicated that parental warmth and harsh parenting were significantly associated with adolescents' prosocial behaviors and emotional problems at the between-person level. At the within-person level, adolescents' more prosocial behaviors at T1 predicted later within-person decreases in their emotional problems at T2, which in turn predicted subsequent increased prosocial behaviors and more parental warmth at T3. Additionally, a higher level of harsh parenting at T2 unidirectionally predicted more adolescents' emotional problems at T3. These findings highlighted the developmental cascade processes among adolescents' prosocial behaviors, emotional problems, and parenting and the importance of fostering adolescents' prosocial behaviors in reducing their emotional problems and then promoting subsequent psychosocial adjustment and parent-child bonding.

Premenstrual symptoms risk factors among newly graduated nurses in shift work: A prospective longitudinal study

PurposeThe premenstrual symptoms (PMS) is a common health issue affecting women of reproductive age and is associated with various physiological, psychological, and situational factors. Newly graduated nurses, when suddenly exposed to excessive workloads and shift work, may experience disturbances such as sleep disorders, fatigue, depression, and stress. These factors are related to PMS, and their occurrence varies. Therefore, this study aimed to understand the changes in PMS and its risk factors among newly graduated nurses across shift work periods, and investigate the longitudinal relationships between PMS and its risk factors based on the Theory of Unpleasant Symptoms. MethodsThis study constituted a secondary data analysis and employed a prospective longitudinal design. Newly graduated nurses were assessed three times: before starting shift work, six months after initiating shift work, and 18 months thereafter. Physiological (age, body mass index, alcohol consumption, dietary behavior), psychological (sleep quality, fatigue, depression, stress, life satisfaction), and situational (social support) factors were included as PMS-related factors. ResultsPMS worsened six months after the initiation of shift work compared to those before, and this aggravation persisted even after 18 months of shift work (p < .001). Age (p = .043), sleep quality (p = .004), and fatigue (p < .001) were associated with PMS. An interaction between time and depression that affected PMS was observed (p = .021). ConclusionsNewly graduated nurses need to pay attention to the exacerbation of PMS after initiating shift work. Interventions to improve sleep quality and reduce fatigue are crucial for novice nurses, irrespective of shiftwork duration. Additionally, it is important to assess depressive symptoms before starting shift work and implement early interventions. Furthermore, the need for interventions addressing depression escalates with the increase in shiftwork duration.

Longitudinal relationships between free-living activities, fatigue, and symptom severity in myasthenia gravis using cohort and individualized models.

Fluctuating symptoms and fatigue are common issues in myasthenia gravis (MG), but it is unclear if these symptoms are related to physical activity or sleep patterns. This study sought to determine the day-to-day relationship between patient-reported symptoms and physical activity and sleep over 12 weeks. Sixteen participants with generalized MG wore a wrist-mounted accelerometer continuously for the study duration and reported their symptoms and fatigue each evening. Cumulative link mixed models were used to analyze whether clinical and demographic characteristics, physical activity, and sleep were related to symptom severity and fatigue over the study period. Three types of models were constructed: a cohort model, a model in which data was scaled to each participant, and individual models. The cohort model indicated that higher disease severity, female sex, more comorbidities, less physical activity, more inactive time, and lower quantity of sleep were significantly associated with increased symptom severity and fatigue (p < .05). However, in the within-participant scaled model, there were almost no significant associations with physical activity or sleep. In the individual models, some participants showed similar results to the cohort model, but others showed no associations or the opposite response in some variables. While physical activity and sleep were associated with self-reported symptoms and fatigue within this population, this was not necessarily applicable to individuals. This demonstrates the importance of an individualized analysis for determining how physical activity and sleep may impact outcomes in MG, with implications for clinical and self-management.

The Impact of Different Types of Social Media Use on the Mental Health of UK Adults: Longitudinal Observational Study

Background Previous studies have explored the association between social media use and mental health among adolescents. However, few studies using nationally representative longitudinal data have explored this relationship for adults and how the effect might change depending on how people use social media. Objective This study investigated the longitudinal relationship between the frequency of viewing and posting on social media and mental health problems among UK adults. Methods This study included 15,836 adults (aged 16 years and older) who participated in Understanding Society, a UK longitudinal survey. Social media use was measured with questions about the frequency of viewing social media and posting on social media in Understanding Society Wave 11 (2019-2021). We explored viewing and posting separately, as well as a combined exposure: (1) high viewing, high posting; (2) high viewing, low posting; (3) low viewing, high posting; and (4) low viewing, low posting. Mental health problems were measured in Wave 12 (2020-2022) using the General Health Questionnaire (GHQ-12), a validated scale for identifying symptoms of common mental health problems, where higher scores indicated more mental health problems (0 to 36). Unadjusted and adjusted linear regression models were estimated for viewing social media and posting on social media, adjusting for the baseline GHQ score, gender, age, ethnicity, employment, and education. We found no evidence for effect modification by gender and age so overall associations were reported. Results In our adjusted models, we found no evidence of an association between the frequency of viewing social media and mental health problems in the following year. We found that adults who posted daily on social media had more mental health problems than those who never posted on social media, corresponding to a 0.35-point increase in GHQ score (β=0.35, 95% CI 0.01-0.68; P=.04). When we considered both social media behaviors, we found that those who frequently viewed and posted on social media scored 0.31 points higher on the GHQ score (β=0.31, 95% CI 0.04-0.58; P=.03) in the following year compared to those who rarely viewed or posted on social media. Conclusions We found that a high frequency of posting on social media was associated with increased mental health problems a year later. However, we did not find evidence of a similar association based on the frequency of viewing social media content. This provides evidence that some types of active social media use (ie, posting) have a stronger link to mental health outcomes than some types of passive social media use (viewing). These results highlighted that the relationship between social media use and mental health is complex, and more research is needed to understand the mechanisms underlying these patterns to inform targeted interventions and policies.

Cumulative Socioeconomic Status Risk is Associated with Greater Increase in Serum Neurofilament Light Chain Levels Among Middle-Aged Black Adults.

This study examined the longitudinal relationship between cumulative socioeconomic status (SES) risk and serum neurofilament light chain (NfL) levels to better understand the association between social factors and a biomarker of neurodegeneration. We used data from the Family and Community Health Study (FACHS), collecting psychosocial and blood data at two waves (2008) and (2019) from 254 Black Americans (43 males and 211 females). Blood samples were analyzed at each wave for serum NfL concentrations. Regression analysis and mixed-effect modeling examined relationships between cumulative SES risk and serum NfL, controlling for covariates and assessing time effects. Utilizing 11-year longitudinal data, serum NfL levels increased with age. Higher cumulative SES risk at baseline correlated with elevated serum NfL at the 11-year follow-up and predicted a greater increase in NfL levels. Clinically, NfL is a sensitive biomarker for axonal injury and neurodegeneration, commonly used to detect early and preclinical stages of conditions such as Alzheimer's disease (AD), multiple sclerosis, and other neurodegenerative disorders. Our results suggest that exposure to cumulative SES risk among Black adults may contribute to elevated levels of NfL, indicating potential early neurodegeneration. Given the established role of NfL in detecting neurodegenerative processes, these findings underscore the importance of interventions that bolster social safety nets and social connectedness to enhance brain health and mitigate neurodegenerative risks.

Occupational Well-Being Profiles and Learning Climate as an Organizational Resource: A Latent Transition Analysis

AbstractThe aim of the present longitudinal study was to profile the occupational well-being (burnout, work engagement) of highly educated employees (n=442) at three measurement points: in 2017 (T1), 2019 (T2), and 2021 (T3). We were interested in whether profile transitions would occur during the follow-up, and if so, whether the three dimensions of perceived learning climate (facilitation, appreciation, and error avoidance) predict these transitions, and hence function as an organizational-level resource that could help highly educated employees to sustain or improve their occupational well-being. We identified three profiles at each measurement point: (1) burnout, lowered engagement; (2) average exhaustion, high engagement; and (3) low burnout, very high engagement. Latent Transition Analysis indicated that employees both maintained their profiles and made transitions during the follow-up. The findings for the second study period (T2-T3) showed a somewhat less favorable development of occupational well-being. Multinomial Logistic Regression Analysis revealed that perceived learning climate predicted the T2-T3 but not T1-T2 transitions. We conclude that employee well-being can simultaneously comprise both positive and negative states. Although the organizational resource perspective gained some support, this tentative evidence also raises the question of whether employees perceive an appreciative learning climate as more stressful than helpful. Overall, the longitudinal relationship of occupational well-being with the dimensions of perceived learning climate warrants further study.

Association between autonomic dysfunction, 12-year mortality and 10-year incident cardiovascular disease

Abstract Background Standing from a supine position requires a co-ordinated response in peripheral and central haemodynamic signals to protect the brain and body from sudden drops in blood pressure (BP) and has previously been shown to be an important measure of neuro-cardiovascular health (1-3). Previous studies have found an association between BP and heart rate recovery (HRR) to standing with all-cause mortality, cardiovascular disease and other health outcomes (4-8). However, almost all of these studies have exclusively investigated the association of consensus-defined HR/BP phenotypes measured at specific timepoints during standing. Purpose We hypothesised that assessing information from the entire haemodynamic response to orthostasis - instead of discrete timepoints or consensus definitions - may uncover novel associations between BP/HR responses to active stand and neuro-cardiovascular health in older adults. This may afford better physiological understanding of the longitudinal relationships between the response to standing and both Cardiovascular Disease (CVD) and mortality. Methods We used functional Principal Components Analysis (FPCA) to examine the determinants of variability in the complete haemodynamic response to active stand and examine which components were related to mortality and incident CVD in &amp;gt;4500 community-dwelling adults aged 50+. Results Figure 1 shows the mean response curve according to mortality status and Figure 2 the mean curve for participants free of CVD at baseline who later have CVD vs those who remain CVD-free during 10 year follow-up. All-cause mortality was associated with functional principal components which discriminate higher baseline HR, blunted HR peak and impaired HRR up to ~25 seconds after standing. Components that discriminated high baseline and impaired recovery of SBP from the post-stand nadir to 60 seconds post stand were also associated with all-cause mortality. This association remained even after covariate adjustment. Interestingly, neither baseline SBP nor orthostatic hypotension (OH) were associated with mortality. Components which discriminate high baseline and blunted HR peak; elevated stroke volume index and impaired recovery of DBP from ~25 seconds post stand were associated with 10-year incident CVD. Conclusions To our knowledge this is the first study to incorporate data driven information over the entire trace of the haemodynamic response to standing to investigate associations with incident CVD and mortality. The fact that components which discriminated high BP and impaired recovery of BP were associated with 12-year mortality and 10-year incident CVD when traditional summary measures of OH and baseline BP were not; suggests that incorporating information across the entire response to standing allows for richer and more flexible associations with health outcomes to be uncovered and allows for a better understanding of the underlying physiology leading to such associations.Figure 1:Mean trace of Mortality StatusFigure 2:Mean Trace of CVD Status

Early life social predictors of longitudinal relations between childhood BMI and overeating

Abstract Introduction The progression of obesity is a continuous process involving a complex system of genetic, environmental, and behavioural factors. Socioeconomic disadvantage as well as psychological distress may lead to overeating, subsequently associated with increased energy intake and weight gain. Recent evidence indicated that the association between childhood obesity and overeating might be bidirectional. Therefore, this study aimed to longitudinally investigate the directionality of the association between childhood BMI and overeating and to identify antecedent early childhood predictors. Methods The study sample included 5,777 children from the European Longitudinal Study of Parents and Children (ELSPAC), collected between 18 months and 11 years of child age. The outcomes were child BMI and overeating. Predictors included maternal BMI, maternal education, single-parent households, financial difficulties, and adverse childhood experiences (ACEs). The random intercept cross-lagged panel model (RI-CLPM) was applied. Results The results showed temporal stability in the development of overeating and BMI, with a bidirectional relationship that strengthened over time. The child’s BMI was predicted by maternal BMI (β = 0.37, p &amp;lt; 0.001). The child’s overeating was predicted by maternal BMI (β = 0.13, p &amp;lt; 0.001), but a stronger effect was found for ACEs (β = 0.24, p &amp;lt; 0.001). ACEs mediated the impact of maternal education, financial difficulties, and single parenthood on overeating with indirect effects of β = -0.01 (p = 0.005), β = 0.04, (p &amp;lt; 0.001), and β = 0.07 (p &amp;lt; 0.001), respectively. Conclusions We observed stable bidirectional longitudinal effects, with a stronger association from BMI to overeating. The results suggested two main pathways: one linked to maternal BMI and early childhood BMI increase followed by overeating, and the other associated with ACEs mediating the effect of early childhood socioeconomic factors on overeating, leading to gradual BMI gain. #NGEU Key messages • The study revealed a stable bidirectional association between childhood BMI and overeating, with a stronger association from BMI to overeating. • There are two potential pathways in childhood obesity development, one involving maternal BMI, and the second associated with social disadvantage and ACEs.

Stability and change in moral disengagement and bullying participation across three years of Japanese middle school

ABSTRACT The present study investigates the longitudinal relationships between bullying roles (bullying, passive bystanding, victimization) and moral disengagement to examine influences on the shifting role of bullying in Japanese middle school students. Participants were 271 Japanese students (Time 1: M age = 12.72, SD = .45, 136 boys and 135 girls) recruited from two public middle schools (9 classes). Five data collection occasions in Grades 7 to 9 alternated between surveys of self-reported bullying behavior (three timepoints) and moral disengagement (two timepoints). Structural equation modeling showed that moral disengagement was reciprocally related to bullying and passive bystanding. Victimization was only related to moral disengagement in Grade 9, such that moral disengagement in June predicted increased victimization experiences in December. These findings suggest that intervention and prevention programs in schools need to actively address moral disengagement, with a focus on bystanders as well as perpetrators and victims of bullying.

Direct and indirect longitudinal relationships among self-efficacy, job performance and career advancements.

The present study examined the longitudinal relations among work self-efficacy beliefs, job performance and career success, defined as objective career advancements. We argued that job performance would mediate both the influence of worker's self-efficacy beliefs on career success and the influence of career success on subsequent self-efficacy beliefs. The participants were 976 employees of one of the largest companies in Italy, assessed at three time points (i.e., Waves 1, 2 and 3), spaced apart by 3 years. Job performance significantly mediated the relationship between self-efficacy beliefs and subsequent career success as well as the reverse influence of career success on subsequent self-efficacy beliefs. The posited conceptual model explained a significant portion of the variance in all endogenous variables and has implications for interventions intended to promote the development of individuals within organisations.

Longitudinal Changes in Peak Expiratory Flow Predict Risk for Incident Dementia.

Impaired respiratory function, measured via peak expiratory flow (PEF), has been associated with increased dementia risk. However, much of the current literature uses cross-sectional measures of PEF, whereas longitudinal relationships between changes in respiratory function and dementia risk are underexplored. Using 10 years of data (2011-2021) from 2,439 adults ages 65 and older in the National Health and Aging Trends Study (NHATS), we examined whether 5-year changes in PEF (2011-2016) were associated with risk for incident dementia over the subsequent 5-year period (2017-2021). PEF slopes for each participant were estimated using linear mixed-effects models and then grouped into quartiles: rapid, moderate, mild, and no declines. Discrete-time Cox proportional hazards models were used to estimate the risk for incident dementia by PEF slope category, while controlling for several health and sociodemographic characteristics. After excluding dementia cases during the exposure window (2011-2016), we identified 338 cases of incident dementia (13.9%) between 2017-2021. Rapid PEF declines between 2011-2016 were associated with 85% higher risk for incident dementia between 2017-2021 compared to those with no declines in PEF (HR=1.85; 95% CI [1.24, 2.76]). Results were robust to several sensitivity analyses. These findings demonstrate that declines in PEF may precede declines in cognition, suggesting that respiratory function may be an important dementia risk factor in older adults. Additionally, these findings highlight the utility of measuring PEF via a peak flow meter, which is a simple and inexpensive measure of respiratory function.

“Give me some flexibility and I will perform better”: longitudinal lessons on the antecedents of job performance

PurposeThis paper aims to examine the longitudinal relationships between the intensity of remote work (IRW) and job performance (JP) with the mediation effect of work–life balance (WLB) and moderation by work overload (WO).Design/methodology/approachA three-wave longitudinal survey, covering pre-pandemic period, the pandemic itself and the post-pandemic period, was conducted among 291 employees. The authors applied linear regression analysis with a moderated mediation effect and the cross-lagged structural equation model with longitudinal mediation using Mplus 8.FindingsThe results show that relationships between IRW and WLB and WLB and JP are negative in the short term; yet over time, employees are able to adapt and benefit from the flexibility offered by remote work (RW). WLB can contribute to better JP in the long run. Furthermore, WLB plays a moderating role in the long-term relationship between RW and JP. There is the second-stage negative moderation effect on this relationship by WO.Practical implicationsThis study recommends a proactive approach toward flexible solutions for employees. It explains that the positive effects of IRW for WLB and JP appear in the longer perspective. Support from organizations to mitigate negative short-term effects is required. Organizations can leverage the mediating role of WLB between IRW and JP in the long term by providing resources and support to help employees achieve WLB in RW settings.Originality/valueThis study extends the research on the antecedents of JP of employees and enriches the extant literature that shows inconsistent findings in terms of the relationships among RW, WLB and JP. It also focuses on the rarely explored intensity of RW. It fills the gap in previous research using a longitudinal research approach. The longitudinal data provide unique and innovative insights into the antecedents of JP of employees and explain complex relationships between them in both the short and long term.

The impact of immersive virtual reality meditation for depression and anxiety among inpatients with major depressive and generalized anxiety disorders.

Mindfulness-Based Cognitive Therapy (MBCT) is a non-pharmacological approach to alleviating depression and anxiety. While technology based MBCT is a standardized cost-effective approach, there have been concerns about its feasibility and effectiveness in clinical settings. The purpose of this study was to investigate the longitudinal relationship between improved emotional regulation resulting from participation in Immersive Virtual Reality Meditation (IVRM) and Major Depressive Disorder (MDD) and Generalized Anxiety Disorder (GAD) as monitored by electrocardiogram. This study was a longitudinal single-arm clinical trial in which the intervention was conducted three times a week for 10 weeks at a behavioral health unit in a community hospital (n = 26). We measured Coherence Achievement Score (CAS), depression, and anxiety. The relationships between CAS, anxiety, depression, and covariates were analyzed using a Generalized Estimated Equation (GEE). The findings of our study provide evidence that the CAS scores indicative of emotional regulation function after IVRM participation were associated with a reduction in depression and anxiety. Among the many technology-based complementary health care interventions that are available to reduce depression and anxiety, IVRM program use increases emotional regulatory function and decrease depression and anxiety.

Gender Differences in Co-developmental Trajectories of Internalizing and Externalizing Problems: A 7-Year Longitudinal Study from Ages 3 to 12.

The co-occurrence of externalizing and internalizing problems is acknowledged, but gender differences remain unclear. The present study examines gender differences in the longitudinal relationships between conduct and emotional problems throughout childhood. The sample, drawn from the ELISA project, included 2368 children (48.1% girls; ages 3-12). Latent growth curve models were employed to analyze the trajectories of parent-reported conduct problems and emotional symptoms separately, while parallel process latent growth curve models were utilized to compare joint trajectories. The decrease in conduct problems was consistent for girls, but not for boys. High initial emotional symptoms predicted a slower increase in emotional symptoms over time for girls. Parental positivity was a protective factor for conduct problems in girls. Grandiose-deceitful traits were more related to conduct problems in girls, while callous-unemotional traits were related to emotional symptoms in boys. This study highlights the importance of considering gender in childhood conduct and emotional problems.

Maternal sensitivity and child attachment security in a low SES Peruvian sample: longitudinal relationships

ABSTRACT We tested the generalizability of the sensitivity-security link in a sample of 35 preschooler-mother dyads from a low socioeconomic district in Lima, Peru. We first describe maternal sensitivity and attachment security at two timepoints during early childhood. Second, we investigated the stability of attachment security and maternal sensitivity over a time span of one year. Third, we tested the association between sensitivity and security at each timepoint. Finally, we investigated whether changes in maternal sensitivity predict changes in child security. The results indicated that sensitivity and security were lower than scores reported in the literature for middle-class samples. T2 maternal sensitivity scores were significantly higher than T1 sensitivity scores, and no significant differences were found between T1 and T2 security. Sensitivity and security were associated at both timepoints, after controlling for socio-demographic variables. One-tail test indicated that changes in maternal sensitivity were associated with changes in child security.

Bandgap estimation and broadening of piezoelectric metamaterial beams undergoing longitudinal vibration

Abstract In the realm of acoustic metamaterials, two crucial challenges have attracted significant interests: (1) How to predict the bandgap range fast and accurately? (2) How to achieve a broader bandgap at a relatively low cost? This paper addresses these challenges by analyzing a type of piezoelectric metamaterial beams comprising unit cells with sub-cells undergoing longitudinal vibration. The longitudinal bandgap estimation relationship based on the effective medium theory is proposed for the first time to estimate the bandgap range of piezoelectric metamaterial beams with unit cells containing sub-cells, and verified with the transfer matrix method. Moreover, novel methods are introduced to construct graded piezoelectric metamaterial beams by combining different sub-cells within a single cell. The proposed graded piezoelectric metamaterial beams occupy significantly less space than conventional graded counterparts and exhibit wider longitudinal bandgaps compared to uniform piezoelectric metamaterial beams.