Multilevel Growth Models Research Articles

Linking person-specific network parameters to between-person trait change.

Typical nomothetic, dimensional conceptualizations of personality traits have demonstrated that traits show robust patterns of change across the lifespan. Yet, questions linger about both the mechanisms underlying trait change and the extent to which we can understand any individual using only dimensional approaches. Alternatively, a person-specific conceptualization of personality that emphasizes processes specific to one person may offer more insight into changes at the expense of generalizability. We argue that taking an idiographic, person-specific dynamic network approach to understanding a person provides an opportunity to bridge the nomothetic-idiographic gap and understand processes underlying trait change that may point to how personality changes across the lifespan. In this study, we examined whether the properties of idiographic personality networks were related to between-person personality trait changes in a sample of college students (N = 418). We used dynamic exploratory graph analysis to construct N = 1 personality networks and then included network parameters in multilevel growth models over a 2-year period using self- and informant-report data. We found that network parameters were largely unrelated to between-person change for self-reports but were related to some informant-reports. Discussion revolves around continuing to bridge the two approaches together to create a holistic picture of personality change. (PsycInfo Database Record (c) 2025 APA, all rights reserved).

Trajectories of the Late Positive Potential Across Childhood and Adolescence: A 9-Year Longitudinal Study.

The late positive potential (LPP), an event-related potential reflecting affective processing, may exhibit developmental shifts in magnitude and scalp location. In the present longitudinal study, 501 youth (47.3% female; 89.4% White; 12.0% Hispanic) completed the emotion interrupt task to elicit the LPP to neutral, positive, and negative images at approximately 9, 12, 15, and 18 years old (data collected 2010-2022). Multilevel growth models indicated an initial decrease in the occipital LPP and an increase in the parietal and central LPP during late childhood, with rates of change leveling off across adolescence. Trial condition (i.e., valence) significantly impacted trajectories only when the LPP was measured over occipital sites. Results provide novel evidence of stability and change in the LPP across development.

Participation in a daily diary study about suicide ideation yields no iatrogenic effects: A mixed method analysis.

Despite evidence that participation in suicide research is not associated with worsening ideation, behaviors, or intent, the rise of intensive longitudinal methods to assess ideation and behaviors necessitates further investigation for potential iatrogenic effects. The present study assessed rates of change in suicide ideation (SI) in a 10-day daily diary study. Seventy-two adult participants with ongoing SI participated in 10 daily diary surveys and three follow-up assessments. One open-ended item was included to address participant experiences in the study. A multilevel piecewise growth model revealed steady declines in SI for participants over the 10 days. However, rates of SI increased during the follow-up assessments, indicating that participation in the daily surveys was associated with general reductions in SI. Further, qualitative analyses of experiences in the study revealed the following themes: Useful (n = 34), Heightened Awareness (n = 21), Functional (n = 6), Not Useful (n = 6), and Beneficence (n = 4). This study demonstrated that participation in suicide research, including intensive longitudinal methods such as daily diary studies, did not have iatrogenic effects on participants with SI. Qualitative results demonstrated the numerous benefits participants derived while taking part in this study.

Self-concept in first grade and academic performance trajectories: roles of gender and dual-language immersion versus English-medium program enrollment

ABSTRACT This longitudinal study examined the latent structure of self-concept and its association with academic performance for elementary-aged students enrolled in dual-language immersion (DLI) and English-medium instruction (EMI) programs. Participants were 30 students in a Spanish-English DLI program and 40 peers in the same school’s EMI classrooms. The present study used confirmatory factor analysis to examine the structure of self-concept and multilevel growth modeling to investigate the effect of self-concept on academic performance tested in English. Results confirmed a three-factor self-concept construct and differences in several factors by program enrollment. Gender moderated the association between different factors of self-concept and academic performance. These findings suggest important educational implications: more attention to students’ early self-concept may be required as it plays a prominent role in students’ on-going academic achievement.

Therapeutic impacts of recalling and processing positive autobiographical memories on posttrauma health: An open-label study.

The processing of positive memories technique (PPMT) entails detailed narration and processing of specific positive autobiographical memories (AM) and has shown promise in improving posttraumatic stress disorder (PTSD) symptoms. We examined whether participants receiving PPMT reported decreases in PTSD and depressive symptom severity, negative affect levels/reactivity, posttrauma cognitions, and positive emotion dysregulation, as well as increases in positive affect levels/reactivity and the number of retrieved positive AMs across four PPMT sessions. Individuals (N = 70) recruited from the community completed surveys at baseline (pre-PPMT), each PPMT session, and after completing all four PPMT sessions. Multilevel linear growth models indicated session-to-session decreases in PTSD severity, β = -.17, p <.001; depressive symptom severity, β = -.13, p <.001; negative affect levels, β = -.13, p <.001; positive affect reactivity, β = -.14, p =.014; and posttrauma cognitions, β = -.12, p <.001; and session-to-session increases in negative affect reactivity, β =.18, p =.001. Paired-samples t tests indicated decreases in retrieved positive AMs, d = 0.40, p =.001, including specific positive AMs, and negative AMs, d = 0.23, p =.022, and increases in retrieved overgeneral positive AMs, d = -0.38, p =.002, from baseline to postintervention. Thus, PPMT may help decrease PTSD and depression severity, negative affect, posttrauma cognitions, and negative AM recall tendencies. Clinicians may need to incorporate additional skills into the PPMT framework to improve positive affect processes that can be sustained over time.

Physical and neurophysiological maturation associated with ADHD among previously institutionalized children: a randomized controlled trial.

Attention deficit hyperactivity disorder (ADHD) is a common neurodevelopmental outcome among children with a history of early institutional care. Prior research on institutionalized children suggested that accelerated physical growth in childhood is a risk factor for ADHD outcomes. The current study examined physical and neurophysiological growth trajectories among institutionalized children randomized to foster care treatment (n = 59) or care as usual (n = 54), and never institutionalized children (n = 64) enrolled in the Bucharest Early Intervention Project (NCT00747396, clinicaltrials.gov). Participants completed physical and electroencephalography (EEG) assessments at six time points from infancy through adolescence, as well as structured diagnostic interviews at the 54-month and 12-year time points. A series of multilevel growth models and cross-lagged path models were estimated to examine associations among physical and neurophysiological maturation, treatment group, age of foster care placement, and ADHD diagnostic outcomes. Twenty-seven percent of the institutionalized children met research criteria for ADHD at one or both time points. Slowed, prolonged growth of height and head circumference were associated with both ADHD and delayed foster care placement. Placement in foster care versus care as usual, but not ADHD, was associated with maturation of the peak alpha frequency. Among children randomized to foster care, average theta-beta ratio was lower among those with ADHD. There was no evidence that rapid physical maturation led to atypical cortical activity. Delayed, prolonged physical growth and atypical neurophysiology from infancy through adolescence is associated with ADHD among institutionalized children, over and above the protective effects of foster care.

Enhancing French Preschoolers’ Early Literacy Skills with a New Educational Classroom Application

ABSTRACT Research Findings: Recent research suggests that the new learning opportunities provided by educational applications can help children strengthen their early literacy skills. The present study assessed whether using AppLINOU, a French educational application, in the classroom helps kindergarten students improve their early literacy skills (alphabet knowledge, phonological awareness, and oral language). This study is one of the first to be conducted in France’s kindergartens. The research encompassed 537 students, all following the national curriculum. The experimental group integrated AppLINOU into their lessons, while the control group did not. The experiment lasted 25 weeks, and students completed a 20-min session per week of early literacy activities. Multilevel growth models showed that students in the experimental group performed better in early literacy at the end of the experiment than those in the control group. Specifically, the experimental group demonstrated enhanced letter knowledge and phonological awareness, though no significant impact on oral language was observed. Practice or Policy: The findings carry substantial implications for the design and the integration of educational applications in preschool settings. In particular, these applications require specific attributes, such as oral instructions or feedback, to enhance the engagement of pre-reading children in the designated activities.

직업계고 졸업 취업자의 직장만족도 변화양상 및 영향요인 탐색

The purpose of this study is to examine how the job satisfaction of CTE (career and technical) high school graduates (hereafter referred to as high school graduates) changes over time and to explore the factors that influence the trajectory of job satisfaction. To this end, Korean Education and Employment Panel 2 (KEEP2) data from the third year (2019) to the sixth year (2022) is used to explore the trajectory of job satisfaction and identify the factors affecting this trajectory by applying multilevel growth modeling, which is suitable for identifying changes in job satisfaction during this period. The results of the analysis are as follows. First, job satisfaction among high school graduates did not change over time. Second, the factors that influenced the initial value of job satisfaction were wage, personal advancement potential, benefits, stability, workplace location size, workplace size, work―major congruence level, work skill congruence level, and self-concept. The factor that influenced the rate of change in job satisfaction was personal advancement potential. Third, the study analyzed the trajectory of job satisfaction by school type and found that employees from Meister vocational high schools had a higher initial level of job satisfaction than employees from specialized vocational high schools and maintained a higher level of job satisfaction afterwards. Finally, the implications of this study and directions for future research are discussed.

LONGITUDINAL ASSOCIATIONS BETWEEN MULTIMORBIDITIES AND PATIENT-REPORTED QUALITY OF LIFE

Abstract The global prevalence of multimorbidity is increasing as the population ages. Older adults are very likely to develop multiple chronic conditions, and nearly two-thirds of the older adult population in the U.S. are estimated to be experiencing two or more chronic conditions. The current study examined whether multimorbidity was associated with longitudinal patterns in health-related quality of life (i.e., anxiety, depression, physical function) and whether these associations were moderated by sociodemographic factors (i.e., sex, race, marital status, income, insurance, education). The present pre-registered study used data from the Health Literacy and Cognitive Function Among Older Adults Longitudinal Study (LitCog), a prospective cohort study of English-speaking older adults (N=900). At each measurement occasion, participants reported anxiety, depression, and physical function using the Patient Reported Outcomes Information System (PROMIS), current chronic conditions, and socio-demographic characteristics. We employed multilevel growth models to estimate changes in health-related quality of life, with multimorbidities as a predictor and socio-demographics as covariates. Results indicated that individuals with multiple chronic conditions reported persistently high levels of anxiety and depression, and worse physical function. We found evidence for racial health disparities, such that individuals who identified as non-white experienced worsening health-related quality of life as multimorbidities increased, relative to white participants. These results contribute to the current conversation about the long term impacts of structural and systemic barriers experienced by minoritized groups. We further discuss the public health implications of multimorbidity in older adulthood.

IS AGING IN THEIR CURRENT DWELLING THE BEST OPTION FOR OLDER ADULTS?

Abstract Although the majority of older adults in the United States stay in their current residence, there has been an increase in the number of housing transitions among older adults since 2000. While aging in their current dwelling is the preferred option for most older adults, according to the Ecological Theory of Aging, the Person-Environment fit changes over time, and relocation is one strategy older adults may use to promote better psychological well-being. The association between housing transition and psychological well-being has yet to be fully explored and the effects of housing transition on psychological well-being may vary across different settings and individuals. Using data from the National Health and Aging Trend Study (2011-2015 n=3,549), we applied multilevel growth modeling to examine the association between housing transition and psychological well-being across different settings including within the community, non-nursing residential facilities, and nursing homes over 5 waves. We found that within-community movers tended to report higher well-being over time compared to non-movers (adj. β= 0.32, p=0.021). In contrast, compared to non-movers, non-nursing facility movers and nursing home movers were no different in terms of changes in psychological well-being over time. (adj. β= 0.23, p=0.348; adj. β= 0.41, p=0.394). Our findings suggest that within-community housing transition can be viewed as one way to achieve aging in the right place.

Do children speaking indigenous and regional languages benefit equally from updated curricula? A report on a longitudinal quasi-experimental pilot study in Central Asia

Do children speaking indigenous and regional languages benefit equally from updated curricula? A report on a longitudinal quasi-experimental pilot study in Central Asia

The Interpersonal Theory of Suicide and Relationship Satisfaction: A Daily Diary Study.

Romantic relationships serve as one of the most important relationships in adults' lives, yet the influence of relational dynamics on suicide ideation (SI) is limited and longitudinal associations are unclear. The Interpersonal Theory of Suicide has been applied to romantic relationships broadly and supports motivations of suicide (thwarted belonging and perceived burdensomeness) and relationship satisfaction to be predictors of SI. An online daily diary study (n = 94 adults) was conducted to examine romantic relationship dynamics and mental health indicators in adults over 10 days. Multilevel growth modeling results revealed that higher perceived burdensomeness, but not relational satisfaction or thwarted belonging, was associated with higher initial levels of SI. However, perceived burdensomeness, thwarted belonging, and relationship satisfaction were not associated with rates of change in SI over time. Further, no interaction effects between either relationship satisfaction and thwarted belonging or perceived burdensomeness were found in association with trajectories of SI over the 10-day period. The results of this study indicate that relational satisfaction, through a commonly used global assessment of relational wellbeing, may not have a substantial influence on SI, particularly in individuals with mild SI levels. This may be due to relational satisfaction being relatively consistent, while SI is prone to short-term fluctuations. However, additional research is recommended to address other relational dynamics' influences on SI.

Effects of a culturally tailored patient navigation program on unmet supportive care needs in Hispanic/Latino cancer survivors: A randomized controlled trial.

Patient navigation (PN) is a promising yet underused approach to address Hispanic/Latino (H/L) cancer survivors' unmet supportive care needs. The authors conducted a randomized trial to evaluate the effect of a culturally tailored PN program with the LIVESTRONG Foundation's Cancer Navigation Services (PN-LCNS) on reducing unmet needs in H/L survivors. From 2012 to 2015 at two US sites, 288 H/L survivors diagnosed with breast, prostate, or colorectal cancer were randomized to a PN-LCNS program or to standard PN. Participants assigned to the PN-LCNS program received 3-month PN services; access to phone-based, bilingual, one-on-one support; and additional resources (i.e., guidebook, health journal, and care plan). Participants completed assessments at baseline and at 3, 9, and 15 months post-baseline. The Supportive Care Needs Survey was used to assess unmet needs across five domains: psychological, health system and information, physical and daily living, patient care and support, and sexuality. Intervention effects were tested by using separate multilevel growth models for women and men. Women randomized to the PN-LCNS program, relative to those who received standard PN, had a statistically significant reduction in unmet needs (i.e., overall and for the health systems and information, physical and daily living, and patient care and support domains). Among men, younger age was associated with greater unmet needs at baseline. Prostate cancer survivors reported greater unmet sexual health needs compared with colorectal cancer survivors. There was no significant change in unmet needs among H/L men. A culturally tailored PN program can reduce unmet supportive care needs among H/L women cancer survivors. However, interventions specifically targeting unmet needs in H/L men and sexual health are still necessary (ClinicalTrials.gov identifier NCT02275754). Hispanic/Latino (H/L) cancer survivors often report concerns or needs that are not adequately addressed by the health care team, which could be related to psychological, health system and information, patient care and support, physical and daily living, and sexuality issues. In this randomized controlled trial of 288 H/L survivors diagnosed with breast, prostate, or colorectal cancer, women assigned to a culturally tailored patient navigation program experienced a reduction in unmet needs compared with those who received standard patient navigation. H/L men did not experience a change in unmet needs.

Longitudinal mediation analysis with multilevel and latent growth models: a separable effects causal approach

BackgroundCausal mediation analysis is widespread in applied medical research, especially in longitudinal settings. However, estimating natural mediational effects in such contexts is often difficult because of the presence of post-treatment confounding. Moreover, many models frequently used in applied research, like multilevel and latent growth models, present an additional difficulty, i.e. the presence of latent variables. In this paper, we propose a causal interpretation of these two classes of models based on a novel type of causal effects called separable, which overcome some of the issues of natural effects.MethodsWe formally derive conditions for the identifiability of separable mediational effects and their analytical expressions based on the g-formula. We carry out a simulation study to investigate how moderate and severe model misspecification, as well as violation of the identfiability assumptions, affect estimates. We also present an application to real data.ResultsThe results show how model misspecification impacts the estimates of mediational effects, particularly in the case of severe misspecification, and that the bias worsens over time. The violation of assumptions affects separable effect estimates in a very different way for the mixed effect and the latent growth models.ConclusionOur approach allows us to give multilevel and latent growth models an appealing causal interpretation based on separable effects. The simulation study shows that model misspecification can heavily impact effect estimates, highlighting the importance of careful model choice.

Cumulative stressor exposure predicts menstrual cycle affective changes in a transdiagnostic outpatient sample with past-month suicidal ideation.

Affective responses to the menstrual cycle vary widely. Some individuals experience severe symptoms like those with premenstrual dysphoric disorder, while others have minimal changes. The reasons for these differences are unclear, but prior studies suggest stressor exposure may play a role. However, research in at-risk psychiatric samples is lacking. In a large clinical sample, we conducted a prospective study of how lifetime stressors relate to degree of affective change across the cycle. 114 outpatients with past-month suicidal ideation (SI) provided daily ratings (n = 6187) of negative affect and SI across 1-3 menstrual cycles. Participants completed the Stress and Adversity Inventory (STRAIN), which measures different stressor exposures (i.e. interpersonal loss, physical danger) throughout the life course, including before and after menarche. Multilevel polynomial growth models tested the relationship between menstrual cycle time and symptoms, moderated by stressor exposure. Greater lifetime stressor exposure predicted a more pronounced perimenstrual increase in active SI, along with marginally significant similar patterns for negative affect and passive SI. Additionally, pre-menarche stressors significantly increased the cyclicity of active SI compared to post-menarche stressors. Exposure to more interpersonal loss stressors predicted greater perimenstrual symptom change of negative affect, passive SI and active SI. Exploratory item-level analyses showed that lifetime stressors moderated a more severe perimenstrual symptom trajectory for mood swings, anger/irritability, rejection sensitivity, and interpersonal conflict. These findings suggest that greater lifetime stressor exposure may lead to heightened emotional reactivity to ovarian hormone fluctuations, elevating the risk of psychopathology.

Context matters: Norm salience toward aggression moderates the association between parental education and childhood aggressive behavior development

This longitudinal study investigated whether classroom norm salience toward aggression moderated the association between parental education and children’s overt aggressive behavior development from third to sixth grade of elementary school. Children ( N = 1,205, 51% girls) from 46 Dutch elementary schools were annually followed from third to sixth grade. Norm salience was operationalized by within-classroom correlations between individual children’s peer-nominated social preference and aggression scores. Results from multilevel latent growth models showed that norm salience development from third to sixth grade, but not norm salience in third grade, was a significant moderator. That is, results suggested that in third grade, children of lower-educated parents showed higher levels of overt aggressive behavior than children of higher-educated parents, irrespective of the norm. However, in classrooms where norm salience became more favorable toward aggression over time, children of lower-educated parents showed a slower growth rate of overt aggressive behavior than children of higher-educated parents from third to sixth grade. In classrooms where norm salience became less favorable toward aggression over time, the development of overt aggressive behavior was similar for all children. Findings suggest that classroom norm salience may become more important in the later elementary school years and that children of higher-educated parents may be more able to adapt their behavior toward the classroom norm.

The Impact of Adversity on Body Mass Index as Veterans Transition to Civilian Life

ABSTRACT Introduction The impact of adverse childhood experiences (ACEs), warfare exposure, and mental health symptoms upon changes in body mass index (BMI) were examined in a large U.S. post-9/11 veteran sample to assess gender-specific changes in BMI within the first 2½ years after military service. Materials and Methods Data were collected with institutional approval in 6 waves between 2016 and 2019 from veterans who (1) separated from active duty component service branches (i.e., Army, Navy, Air Force, and Marine Corps) or National Guard or Reserve or (2) deactivated from active duty status after serving in a National Guard or Reserve component. Veterans self-reported height and weight at separation/deactivation at wave 2, and weight was asked at each subsequent wave. Multilevel growth model analyses estimated the relationship between ACEs, warfare exposure, and mental health symptoms and BMI for males and females. Weighted wave 5 analyses were conducted to ensure the sample was calibrated for nonresponse based on wave 1 and the full sample (n = 48,965) for each cross-classification of the weighting variables of gender, rank, and branch. Results Approximately one-third of the veterans reported a normal BMI at separation/deactivation in comparison to being overweight (51%) or obese (20%). Twenty-six percent of male veterans had a normal BMI in contrast to almost half of the female veterans. Male veterans who experienced 3-7 ACEs had a higher BMI (0.74) compared to male veterans without any ACEs, where a BMI increase of 0.08 per year was reported. Female veterans who experienced 1-2 ACEs had a higher BMI (0.89) compared to female veterans without ACEs. Male veterans who engaged in warfare (e.g., combat patrols and firing a weapon at enemy combatants) and experienced corollaries (i.e., consequences of combat) or who experienced corollaries alone (e.g., saw refugees who lost their homes/belongings) had higher BMIs (1.14 and 0.82, respectively) compared to male veterans without warfare exposure. Female veterans who experienced corollaries had a higher BMI (0.94) compared to female veterans with no warfare exposure. Female veterans who experienced warfare (i.e., corollaries and combat) had a higher BMI (0.71) compared to female veterans with no warfare exposure. Male veterans who screened positive for likely post-traumatic stress disorder (PTSD) or depressive symptoms had a higher BMI (1.01 and 0.52, respectively) compared to male veterans who did not screen positive. Male veterans who screened positive for likely PTSD increased their BMI by 0.10 per year. Male veterans who screened positive for both likely PTSD and depressive symptoms had a higher BMI (1.32) compared to male veterans who did not screen positive, and they increased their BMI by 0.21 per year. Female veterans who screened positive for likely PTSD and depressive symptoms had a higher BMI (0.78) and increased their BMI by 0.25 per year compared to female veterans who did not screen positive. Conclusions Boosting veterans’ and service members’ mental and emotional healing from childhood and warfare adversities through sound health promotion policies and increased access to evidence-informed interventions is imperative for optimal body weight and physical health.

The effectiveness of a knowledge translation intervention on the implementation of NEWS2 in nursing homes, a pragmatic cluster RCT

BackgroundImproving the uptake of relevant and reliable research is an important priority in long-term care to achieve sustainable and high-quality services for the increasingly older population.AimThe purpose was to assess the effectiveness of a tailored, adaptive and a multifaceted KT capacity program, relative to usual practice, on the implementation of National Early Warning Score 2 (NEWS2).MethodsThis study was carried out as a pragmatic cluster-randomized controlled trial. The capacity program consisted of an educational part to address implementation capacity gaps and a facilitation-upon-implementation part to address a relevant knowledge gap in nursing homes. A collective decision was made to address the challenge of early detection of clinical deterioration among nursing home residents, by implementing the (NEWS2) as clinical innovation.Public nursing homes in a Norwegian municipality (n = 21) with a total of 1 466 beds were eligible for inclusion. The study-period spanned over a 22-month period, including a 12-month follow-up.Data was extracted from the Electronic Patient Journal system and analyzed using multilevel growth model analysis.ResultsThe intervention had a large effect on the use of NEWS2 among care staff in intervention nursing homes, compared to the control group (standardized mean difference, d = 2.42). During the final month of the implementation period, residents in the intervention group was assessed with NEWS2 1.44 times (95% CI: 1.23, 1.64) per month, which is almost four times more often than in the control group (mean = 0.38, 95% CI: 0.19, 0.57). During the follow-up period, the effect of the intervention was not only sustained in the intervention group but there was a substantial increase in the use of NEWS2 in both the intervention (mean = 1.75, 95% CI: 1.55, 1.96) and control groups (mean = 1.45, 95% CI: 1.27, 1.65).ConclusionsThis tailored implementation strategy had a large effect on the use of NEWS2 among care staff, demonstrating that integrated knowledge translation strategies can be a promising strategy to achieve evidence-based care in the nursing home sector.Trial registrationISRCTN12437773. Registered 19/3 2020, retrospectively.

Age-related Changes in Past-Month Alcohol, Cannabis, and Simultaneous Use in a Statewide Sample of Young Adults in Washington State.

It is unknown whether age-related decreases in substance use (maturing out) are observed in the legalized cannabis context. This study evaluated age-related changes in past-month alcohol use frequency, cannabis use frequency, and any simultaneous alcohol and marijuana/cannabis (SAM) use among young adults who engaged in the respective substance use behavior. Young adults, residing in Washington State at enrollment (N=6,509; 68.3% female; ages 18-25), provided 3-5 years of annual data in a longitudinal, cohort-sequential design from 2015 to 2019, a period after nonmedical cannabis was legalized and implemented. Multilevel growth models were conducted; post-stratification weights were applied to make the sample more similar to the Washington young adult general population in demographic characteristics. Among those who reported alcohol use at 1+ timepoints, days of alcohol use increased from age 18 to approximately age 25 and then decreased until age 30. Among those who reported cannabis use at 1+ timepoints, days of cannabis use increased from age 18 until approximately age 23 and then decreased until age 30. Among those who reported SAM use at 1+ timepoints, the probability of SAM use increased from age 18 until approximately age 24 and then decreased until age 30. Age-related changes in SAM use were largely explained by concurrent changes in alcohol and cannabis use frequency. Maturing out was observed for alcohol, cannabis, and SAM use among those who used each respective substance, with evidence that age-related changes in SAM use were tied to alcohol and cannabis use frequency.

Longitudinal investigation of early mathematical achievement and classroom strategic diversity: A replication and extension study

Longitudinal investigation of early mathematical achievement and classroom strategic diversity: A replication and extension study