Browsing by Author "Bai, Yu"
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Item Open Access A defensive mindset: A pattern of social information processing that develops early and predicts life course outcomes.(Child development, 2022-07) Dodge, Kenneth A; Bai, Yu; Godwin, Jennifer; Lansford, Jennifer E; Bates, John E; Pettit, Gregory S; Jones, DamonThe hypothesis was tested that some children develop a defensive mindset that subsumes individual social information processing (SIP) steps, grows from early experiences, and guides long-term outcomes. In Study 1 (Fast Track [FT]), 463 age-5 children (45% girls; 43% Black) were first assessed in 1991 and followed through age 32 (83% retention). In Study 2 (Child Development Project [CDP]), 585 age-5 children (48% girls, 17% Black) were first assessed in 1987 and followed through age 34 (78% retention). In both studies, measures were collected of early adverse experiences, defensive mindset and SIP, and adult outcomes. Across both studies, a robust latent construct of school-age defensive mindset was validated empirically (comparative fit index = .99 in each study) and found to mediate the impact of early child abuse (38% in FT and 29% in CDP of total effect) and peer social rejection (14% in FT and 7% in CDP of total effect) on adult incarceration.Item Open Access America's Promise Alliance: 10 Indicators of Academic Achievement and Youth Success(America's Promise Alliance: 10 Indicators of Academic Achievement and Youth Success) Gifford, E; Evans, Kelly; Berlin, L.J.; Bai, YuItem Open Access America’s Promise Alliance: 10 Indicators of Academic Achievement and Youth Success(America’s Promise Alliance: 10 Indicators of Academic Achievement and Youth Success, 2011-07) Gifford, E; Evans, Kellu; Berlin, Lisa; Bai, YuItem Open Access Birth Spacing and Child Maltreatment: Population-Level Estimates for North Carolina.(Child maltreatment, 2023-04) Rybińska, Anna; Bai, Yu; Goodman, W Benjamin; Dodge, Kenneth AWe examine population-level associations between birth spacing and child maltreatment using birth records and child welfare records for 1,099,230 second or higher parity children born in North Carolina between 1997 and 2013. Building upon previous research, administrative data linkages were used to address out-of-state migration and family-level heterogeneity in birth spacing and child maltreatment risk factors. Findings provide the strongest evidence to date that very short birth spacing of zero through 6 months from last birth to the index child's conception is a prenatal predictor of child maltreatment (indexed as child welfare involvement) throughout early childhood. Consequently, information about optimal family planning during the postpartum period should become a standard component of universal and targeted child maltreatment prevention programs. However, challenging previous empirical evidence, this study reports inconsistent results for benefits of additional spacing delay beyond 6 months with regard to child maltreatment risk reduction, especially for children of racial and ethnic minorities. These findings call for further inquiry about the mechanisms driving the connections between birth spacing and Child Protective Services assessments.Item Open Access Brief Report: Classifying Rates of Students with Autism and Intellectual Disability in North Carolina: Roles of Race and Economic Disadvantage.(Journal of autism and developmental disorders, 2020-05-13) Howard, Jill; Copeland, J Nathan; Gifford, Elizabeth J; Lawson, Jennifer; Bai, Yu; Heilbron, Nicole; Maslow, GaryWe examined special education classifications among students aged 3-21 in North Carolina public schools, highlighting autism spectrum disorder (ASD) and intellectual disability (ID). Results revealed variability by county in ASD and ID prevalence, and in county-level ratios of ID vs. ASD classifications. Sociodemographic characteristics predicted proportion of ASD or ID within a county; correlations showed an association between race and ID, but not ASD. County's median household income predicted proportion of students classified as ASD and ID (opposite directions), controlling for number of students and gender. Variability was unlikely related to biological incidence, and more likely related to district/school practices, or differences in resources. Disparities warrant further examination to ensure that North Carolina's youth with disabilities access necessary, appropriate resources.Item Open Access Effect of a Community Agency-Administered Nurse Home Visitation Program on Program Use and Maternal and Infant Health Outcomes: A Randomized Clinical Trial.(JAMA network open, 2019-11) Dodge, Kenneth A; Goodman, W Benjamin; Bai, Yu; O'Donnell, Karen; Murphy, Robert AImportance:Postnatal home visitation to support parenting and infant healthy development is becoming increasingly common based on university efficacy studies, but effectiveness when disseminated by communities is not clear. Objective:To test implementation and impact of the Family Connects (FC) program when administered by a community agency. Design, Setting, and Participants:In this randomized clinical trial, births were randomly assigned to receive FC or treatment as usual. Independent evaluation was conducted through parent interviews and review of health and child protective services records. Interviewers were blind to the experimental condition of participants, and participants were blind about the purpose of the interview as an intervention evaluation. A total of 936 consecutive residential births at Duke University Hospital from January 1, 2014, through June 30, 2014, were included. Data were analyzed preliminarily for reporting to funders in early 2015 before all birth-record covariates were scored and were analyzed more comprehensively in mid-2019 after administrative birth and child protective service records became available. Interventions:The goals of the FC brief universal program were to assess family-specific needs, complete brief interventions, and connect families with community resources. Community agencies and families were aligned through an electronic data system. Main Outcomes and Measures:Case records documented program penetration and quality. The primary outcome was child protective services investigations for maltreatment. Secondary outcomes were the number of sustained community connections, maternal mental health, parenting behavior, infant well-child care visits and maternal postpartum care compliance, and emergency health care utilization. Results:Of 936 births, 451 infants (48.2%) were female and 433 (46.3%) were from racial/ethnic minority groups. In all, 456 births (46.5%) were randomized to the intervention and 480 (53.5%) were randomized to the control. All analyses were based on intention to treat. The impact analysis included 158 intervention families and 158 control families. Intervention penetration was 76%, adherence to the protocol was 90%, and independent agreement in scoring (κ) was 0.75. Nurses identified and addressed minor problems for 52% of families and connected an additional 42% to community resources. Analysis of the primary outcome of child abuse investigations revealed a mean (SD) of 0.10 (0.30) investigations for the intervention group vs 0.18 (0.56) investigations for the control group (b = -0.09; 90% CI, -0.01 to -0.12; 95% CI, -0.18 to 0.01; P = .07). The intervention group's rate of possible maternal anxiety or depression was 18.2% vs 25.9% for the control group (b = -7.70; 90% CI, -15.2 to -0.1; 95% CI, -16.6 to 1.3; P = .09). Conclusions and Relevance:This study indicates that a nurse home visitation program for families of newborns can be implemented by a community agency with high penetration and quality. Other communities could benefit from wider dissemination of the program provided that quality remains strong and evaluation continues. Trial Registration:ClinicalTrials.gov identifier: NCT01843036.Item Open Access Effect of a Universal Postpartum Nurse Home Visiting Program on Child Maltreatment and Emergency Medical Care at 5 Years of Age: A Randomized Clinical Trial.(JAMA network open, 2021-07) Goodman, W Benjamin; Dodge, Kenneth A; Bai, Yu; Murphy, Robert A; O'Donnell, KarenImportance
The Family Connects (FC) program, a community-wide nurse home visiting program for newborns, has been shown to provide benefits for children and families through the first 2 years of life. Potential longer-term outcomes for child well-being remain unknown.Objective
To determine the effect of randomization to FC on child maltreatment investigations and emergency medical care through 5 years of age.Design, setting, and participants
In this randomized clinical trial, families of all 4777 resident births in Durham County, North Carolina, from July 1, 2009, to December 31, 2010, were randomly assigned to receive the FC program or treatment as usual. Impact evaluation was on an intent-to-treat basis and focused on a subsample of 549 families randomly selected from the full population and included review of hospital and Child Protective Services (CPS) administrative records. Statistical analysis was conducted from November 6, 2020, to April 25, 2021.Interventions
The FC programs includes 1 to 3 nurse home visits beginning at the infant age of 3 weeks designed to identify family-specific needs, deliver education and intervention, and connect families with community resources matched to their needs. Ongoing program engagement with service professionals and an electronic resource directory facilitate effective family connections to the community.Main outcomes and measures
Two primary trial outcomes were CPS-recorded child maltreatment investigations and emergency medical care use based on hospital records.Results
Of the 4777 randomized families, 2327 were allocated to the intervention, and 2440 were allocated to services as usual. Among the children in the full study population, 2380 (49.8%) were female, 2397 (50.2%) were male, and 3359 (70.3%) were from racial/ethnic minority groups; of the 531 children included in the impact evaluation follow-up, 284 (53.5%) were female, 247 (46.5%) were male, and 390 (73.4%) were from racial/ethnic minority groups. Negative binomial models indicated that families assigned to FC had 39% fewer CPS investigations for suspected child maltreatment through 5 years of age (95% CI, -0.80 to 0.06; 90% CI, -0.73 to -0.01; control = 44 total investigations per 100 children and intervention = 27 total investigations per 100 children); intervention effects did not differ across subgroups. Families assigned to FC also had 33% less total child emergency medical care use (95% CI, -0.59 to -0.14; 90% CI, -0.55 to -0.18; control = 338 visits and overnight hospital stays per 100 children and intervention = 227 visits and overnight hospital stays per 100 children). Positive effects held across birth risk, child health insurance, child sex, single-parent status, and racial/ethnic groups. Effects were larger for nonminority families compared with minority families.Conclusions and relevance
The findings of this randomized clinical trial suggest that, when implemented with high quality and broad reach, a brief postpartum nurse home visiting program can reduce population rates of child maltreatment and emergency medical care use in early childhood.Trial registration
ClinicalTrials.gov Identifier: NCT01406184.Item Open Access Evaluation of a Family Connects Dissemination to Four High-Poverty Rural Counties.(Maternal and child health journal, 2022-05) Goodman, W Benjamin; Dodge, Kenneth A; Bai, Yu; Murphy, Robert A; O'Donnell, KarenObjectives
Home visiting is a popular approach to improving the health and well-being of families with infants and young children in the United States; but, to date, no home visiting program has achieved population impact for families in rural communities. The current report includes evaluation results from the dissemination of a brief, universal postpartum home visiting program to four high-poverty rural counties.Methods
The study utilized a quasi-experimental design. From Sept. 1, 2014-Dec. 31, 2015, families of all 994 resident births in four rural eastern North Carolina counties were assigned to receive Family Connects (FC; intervention group). A representative subsample of families participated in impact evaluation when the infants were 6 months old: 392 intervention group families and 126 families with infants born between Feb. 1, 2014-July 31, 2014 (natural comparison group). Data were analyzed preliminarily for reporting to funders in 2016 and, more comprehensively, using propensity score matching in 2020.Results
Of FC-eligible families, 78% initiated participation; 83% of participating families completed the program (net completion = 65%). At age 6 months, intervention parents reported more community connections, more frequent use of community services, greater social support, and greater success with infants sleeping on their backs. Intervention infants had fewer total emergency department and urgent care visits. Intervention parents had more total emergency department and urgent care visits and (marginally) fewer overnights in the hospital.Conclusions for practice
FC can be implemented successfully in high-poverty rural communities with broad reach and positive benefits for infants and families.Item Open Access Impact of a universal perinatal home-visiting program on reduction in race disparities in maternal and child health: Two randomised controlled trials and a field quasi-experiment.(Lancet regional health. Americas, 2022-11) Dodge, Kenneth A; Goodman, W Benjamin; Bai, Yu; Best, Debra L; Rehder, Peter; Hill, SherikaBackground
Public health interventions must become accountable for reduction of race disparities, particularly among Black, Hispanic, and Non-Hispanic White families in the United States. Family Connects (FC) is a universal perinatal home-visiting program that assesses family-specific needs, offers support, and provides connections to community resources to address identified needs. Two previously-published randomised controlled trials and a field quasi-experiment have shown positive impact on maternal mental health, infant emergency medical care utilization, and government investigations for child maltreatment; however, these reports have not tested impact on reducing race disparities in these outcomes. The current report examined three questions in these trials: 1) the extent of race disparities in maternal and infant health and well-being, absent intervention; 2) whether intervention can be implemented with high reach and fidelity among all race groups; and 3) whether assignment to intervention reduces race disparities in important outcomes.Methods
Data were re-examined from: 1) a randomised controlled trial of 4777 birthing families in Durham, NC, USA; 2) a replication randomised controlled trial of 923 birthing families in Durham, NC, USA; and 3) a quasi-experiment of 988 birthing families in rural NC, USA. Families were classified as Black, Hispanic, Non-Hispanic White, or Other. Disparity reduction was tested by the interaction effect between treatment assignment and race.Findings
1) In the absence of intervention, large and statistically significant differences between Black familes and Non-Hispanic White families were found in maternal anxiety, maternal depression, father non-support, child emergency medical care, and child maltreatment investigations. Few differences were found between Non-Hispanic White familes and Hispanic families.2) High rates of participation in treatment were found for each race group.3) Across studies, assignment to FC was associated with statistically significant reductions in 7 of 12 disparities, in maternal anxiety and depression, father non-support, infant emergency medical care, and child maltreatment investigations.Interpretation
This study provides a method, metric, and mandate to prioritise testing of whether public health interventions reduce race disparities in family outcomes.Funding
This research was supported by grant R01HD069981 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development and a grant from The Duke Endowment.Item Open Access Impact of the COVID-19 pandemic on substance use among adults without children, parents, and adolescents.(Addictive behaviors reports, 2021-12) Dodge, Kenneth A; Skinner, Ann T; Godwin, Jennifer; Bai, Yu; Lansford, Jennifer E; Copeland, William E; Goodman, Ben; McMahon, Robert J; Goulter, Natalie; Bornstein, Marc H; Pettit, Gregory S; Bates, John EImpact of the COVID-19 pandemic on alcohol and illicit substance use among adults without children, parents, and adolescents was investigated through two studies with five samples from independent ongoing U.S. longitudinal studies. In Study 1, 931 adults without children, parents, and adolescents were surveyed about the pandemic's impact on personal behavior. 19-25% of adults without children, parents, and adolescents reported an increase in alcohol or illicit substance use. In Study 2, 274 adults without children, parents, and adolescents who had been interviewed prior to the pandemic onset about alcohol and illicit substance use problems were re-interviewed after the pandemic's onset to test within-person change. The rate of alcohol or illicit substance use problems increased from pre-pandemic to post-pandemic onset from 13% to 36% among the three groups. Increase in alcohol and illicit substance use problems was positively correlated with increased depression/anxiety and household disruption, suggesting possible mechanisms for increases in substance problems. Findings in both studies held across low- and middle-income families. Findings suggest the need for communitywide policies to increase resources for alcohol and illicit substance use screening and intervention, especially for adolescents.Item Open Access Is implementation fidelity associated with improved access to care in a school-based Child and Family Team model?(Eval Program Plann, 2015-04) Gifford, Elizabeth J; Wells, Rebecca S; Bai, Yu; Malone, Patrick SEffective child and family centered service planning is crucial to addressing vulnerable children's needs. However, there is limited evidence about what facets of these processes improve service use and outcomes. The current study used a Poisson random effects hazard model to test correlations between fidelity to NC's Child and Family Support Team model and time to service receipt, using case management data for 3396 children served by that program during the 2008-2009 school year. Students were more likely to receive recommended services more quickly when caregivers and the students attended planning meetings, when their plans included services for caregivers, and when child and family team leaders followed up after meetings to verify service receipt. Contrary to the Child and Family Support Team theory of change, match between student needs and the lead agency of the meeting was not associated with the odds of quicker service receipt, nor was attendance by natural supports. Findings from this study demonstrate the potential effectiveness of using case management systems to measure service planning process fidelity, as well as how results thereof can both inform process improvement and potential refinements to models' theories of change.Item Open Access Long-term effects of early childhood programs through eighth grade: Do the effects fade out or grow?(Children and Youth Services Review, 2020-05-01) Bai, Yu; Ladd, Helen F; Muschkin, Clara G; Dodge, Kenneth A© 2020 Support for policies to improve early childhood educational development and reduce disparities grew rapidly this century but recently has wavered because of findings that program effects might fade out prematurely. Two programs implemented at scale in North Carolina (Smart Start and More at Four) have been associated with academic success early in elementary school, but it is not known whether these effects fade out or are sustained in middle school. Smart Start provides state funding to support high-quality early childcare in local communities, and More at Four provides state-funded slots for a year of credentialed pre-kindergarten. Funds were allocated for each program at varying rates across counties and years. We used this variation to estimate the long-term impact of each program through eighth grade, by measuring the association between state funding allocations to each program, in each of 100 counties over each of 13 consecutive years, and later student performance. Students were matched to funding levels provided to their home county in their early childhood years and then followed through eighth grade. Analyses using county- and year-fixed-effects regression models with individual- and school-level covariates conducted on nearly 900,000 middle school students indicate significant positive impacts of funding for each program on reading and math test scores and reductions in special education placement and grade retention. These impacts do not fade out and seem instead to grow (for More at Four) as students progress through middle school. Students from economically disadvantaged backgrounds experience particularly large benefits from the More at Four Program.Item Open Access Maximizing the return on investment in Early Childhood Home Visiting through enhanced eligibility screening.(Child abuse & neglect, 2021-12) Dodge, Kenneth A; Benjamin Goodman, W; Bai, Yu; Murphy, Robert A; O'Donnell, KarenBackground
The MIECHV (Maternal, Infant, and Early Childhood Home Visiting) program invests substantial federal resources to prevent child maltreatment and emergency medical costs. Eligibility is based on screening of demographic or clinical risk factors, but because screening accuracy in predicting poor outcomes is unknown, assignment to home-visiting might miss high-risk families or waste resources on low-risk families.Objectives
To guide eligibility decisions, this study tested accuracy of demographic and clinical screening in predicting child maltreatment and emergency medical care.Participants and setting
A population-representative sample of 201 birthing mothers (39.8% Black, 33.8% Latina) in Durham, NC, was enrolled between July 2009, and December 2010, and followed through December 2015.Methods
Participants were screened demographically (i.e., Medicaid, first-born, teenage, no high school diploma) and clinically (i.e., health/health care, parenting readiness, home safety, and parent mental health) at birth and followed through age 60 months, when Child Protective Services and hospital records were reviewed. Cox hazard models tested accuracy of prediction from screening variables.Results
Demographic factors did not significantly predict outcomes, except having Medicaid/uninsured predicted more emergency medical care and being first-born was a (surprising) protective factor against a child maltreatment investigation. In contrast, clinical factors strongly predicted both maltreatment investigations (Hazard Ratio = 4.01 [95% CI = 1.97, 8.15], sensitivity = 0.70, specificity = 0.64, accuracy = 0.65) and emergency medical care (Hazard Ratio = 2.14 [95% CI = 1.03, 2.14], sensitivity = 0.50, specificity = 0.69, accuracy = 0.58).Conclusions
Even with added costs for clinical screening, selecting families for home visiting based on assessed clinical risk will improve accuracy and may yield a higher return on investment. The authors recommend a universal system of screening and care to support birthing families.Item Open Access Randomized controlled trial of Family Connects: Effects on child emergency medical care from birth to 24 months(Development and Psychopathology) Goodman, W Benjamin; Dodge, Kenneth A; Bai, Yu; O'Donnell, Karen J; Murphy, Robert AAbstractOne of Tom Dishion's most significant contributions to prevention science was the development of affordable, ecologically valid interventions, such as the Family Check-Up, that screen for child and family risk factors broadly, but concentrate family-specific interventions on those with greatest potential for population impact. In the spirit of this approach, investigators examined effects of a brief, universal postnatal home visiting program on child emergency medical care and billing costs from birth to age 24 months. Family Connects is a community-wide public health intervention that combines identification and alignment of community services and resources with brief, postpartum nurse home visits designed to assess risk, provide supportive guidance, and connect families with identified risk to community resources. Over 18 months, families of all 4,777 resident Durham County, North Carolina, births were randomly assigned based on even or odd birth date to receive a postnatal nurse home visiting intervention or services as usual (control). Independently, 549 of these families were randomly selected and participated in an impact evaluation study. Families, blind to study goals, provided written consent to access hospital administrative records. Results indicate that children randomly assigned to Family Connects had significantly less total emergency medical care (by 37%) through age 24 months, with results observed across almost all subgroups. Examination of billing records indicate a $3.17 decrease in total billing costs for each $1 in program costs. Overall, results suggest that community-wide postpartum support program can significantly reduce population rates of child emergency medical care through age 24 months while being cost-beneficial to communities.Item Open Access The effects of a universal short-term home visiting program: Two-year impact on parenting behavior and parent mental health.(Child abuse & neglect, 2023-06) Baziyants, Gayane A; Dodge, Kenneth A; Bai, Yu; Goodman, W Benjamin; O'Donnell, Karen; Murphy, Robert ABackground
At the time of childbirth, families face heightened levels of unmet need. These needs, if left unmet, can lead parents to engage in less positive parenting practices, which in turn, increase the risk of child maltreatment. Family Connects (FC) is a universal postnatal nurse home-visiting program designed to prevent child maltreatment by supporting all families in a community through one to three visits to improve parent mental health and parenting behaviors. A randomized controlled trial of FC demonstrated improving positive parenting and reducing postpartum depression through age 6 months.Objective
To determine sustained (2-year) impact of random assignment to FC on parenting behavior and parent mental health and identify heterogeneity of effects.Participants and setting
A representative subsample of 496 families that had been randomized to FC (255 treatment; 241 control) of infants born between July 1, 2009, and December 31, 2010, in Durham County, North Carolina.Methods
Demographic characteristics were collected through hospital discharge data. Treatment-blinded interviewers collected maternal reports of parenting behavior and mental health at infant age two years. Moderation and subgroup analyses were conducted to estimate heterogeneity in impact of FC.Results
Mothers assigned to FC engaged in more self-reported positive parenting relative to control mothers (B = 0.21; p < 0.05). Hispanic mothers assigned to FC reported greater sense of parenting competence (B = 1.28; p < 0.05). No significant main effect differences were identified for negative parenting, maternal depression, or father involvement.Conclusions
Assignment to FC was associated with improvements in population-level self-reported scores of positive parenting 2 years post-intervention.Item Open Access Transitioning to virtual interaction during the COVID-19 pandemic: Impact on the family connects postpartum home visiting program activity.(Infant mental health journal, 2022-01-08) Rybińska, Anna; Best, Debra L; Goodman, W Benjamin; Bai, Yu; Dodge, Kenneth AIn this paper, we analyze program activity for Family Connects (FC), an evidence-based postpartum home-visiting intervention, during the COVID-19 pandemic. When the pandemic began, FC transitioned to a virtual protocol which maintains key psychosocial components of the in-person protocol and adjusts health assessments to address the lack of in-person contact. Program performance is contrasted for periods before the pandemic onset (April 2019-March 2020) and after the onset (April 2020-March 2021), involving 10,280 scheduled visits and 6696 visited families (46% non-Hispanic white; 20% non-Hispanic Black; 23% Hispanic; and 10% other race). Post-pandemic onset, FC program participation rates were at 89.8% of pre-pandemic levels. Home visitors observed post-onset increases in families' concerns about home safety but declines in families' needs related to infant care. Community connections were facilitated for 42.9% of visited families post-pandemic onset compared to 51.1% pre-pandemic onset. We conclude that post-pandemic onset virtual delivery rates of FC declined but are high enough to merit continued implementation during a period when some families will decline in-person visits. When in-person visits are deemed safe per public health guidelines, the findings suggest a hybrid approach that could maximize program outreach by prioritizing in-person contact and offering virtual delivery as a second choice.Item Open Access Understanding Heterogeneity in the Impact of Public Preschool Programs.(Monographs of the Society for Research in Child Development, 2023-06) Watts, Tyler W; Jenkins, Jade M; Dodge, Kenneth A; Carr, Robert C; Sauval, Maria; Bai, Yu; Escueta, Maya; Duer, Jennifer; Ladd, Helen; Muschkin, Clara; Peisner-Feinberg, Ellen; Ananat, ElizabethWe examine the North Carolina Pre-K (NC Pre-K) program to test the hypothesis that observed variation in effects resulting from exposure to the program can be attributed to interactions with other environmental factors that occur before, during, or after the pre-k year. We examine student outcomes in 5th grade and test interaction effects between NC's level of investment in public pre-k and moderating factors. Our main sample includes the population of children born in North Carolina between 1987 and 2005 who later attended a public school in that state, had valid achievement data in 5th grade, and could be matched by administrative record review (n = 1,207,576; 58% White non-Hispanic, 29% Black non-Hispanic, 7% Hispanic, 6% multiracial and Other race/ethnicity). Analyses were based on a natural experiment leveraging variation in county-level funding for NC Pre-K across NC counties during each of the years the state scaled up the program. Exposure to NC Pre-K funding was defined as the per-4-year-old-child state allocation of funds to a county in a year. Regression models included child-level and county-level covariates and county and year fixed effects. Estimates indicate that a child's exposure to higher NC Pre-K funding was positively associated with that child's academic achievement 6 years later. We found no effect on special education placement or grade retention. NC Pre-K funding effects on achievement were positive for all subgroups tested, and statistically significant for most. However, they were larger for children exposed to more disadvantaged environments either before or after the pre-k experience, consistent with a compensatory model where pre-k provides a buffer against the adverse effects of prior negative environmental experiences and protection against the effects of future adverse experiences. In addition, the effect of NC Pre-K funding on achievement remained positive across most environments, supporting an additive effects model. In contrast, few findings supported a dynamic complementarity model. Instrumental variables analyses incorporating a child's NC Pre-K enrollment status indicate that program attendance increased average 5th grade achievement by approximately 20% of a standard deviation, and impacts were largest for children who were Hispanic or whose mothers had less than a high school education. Implications for the future of pre-k scale-up and developmental theory are discussed.