Critical Periods in Child Development and the Transition to Adulthood
Open accessAbstract
Adverse childhood experiences (ACEs) can affect development in ways that disrupt the formation of human capital and contribute to later-life morbidity and mortality.Theories of development predict that the timing of adversity will affect its outcomes.However, empirical evidence for timing-specific effects remains scant.In this issue of JAMA Network Open, Andersen 1 reports an analysis of population-register data from Denmark that suggests timing-specific associations of household dysfunction ACEs with young people's successful transition to adulthood.Andersen's study 1 linked data from several Danish registers to compose records tracking children born between 1987 and 1995 and their families from the child's birth until they reached age 19 years.The analysis tested how exposure to household dysfunction ACEs during ages 0 to 2, 3 to 5, 6 to 12, and 13 to 17 years were associated with disruptions in children's transition to adulthood.Children's ACE exposure was measured from records of parental unemployment, incarceration, psychiatric diagnoses, and divorce as well as children's placement in foster care.Disruption to the transition to adulthood was measured from records of education, employment, criminal charges, and psychiatric diagnoses.Andersen's
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Written from the paper’s full text.
TL;DR
This JAMA Network Open commentary by Graf discusses Andersen's population-register study of Danish children, which found that household dysfunction ACEs—especially during adolescence—were associated with disrupted transitions to adulthood. The author argues the findings challenge the "first 1000 days" narrative and support adolescence as a second critical period for intervention.
Key findings
Andersen's sibling-comparison analysis identified a dose-response association between accumulation of ACEs and increased likelihood of disruption to the transition to adulthood. Adversity exposures during adolescence (ages 13–17) had larger-magnitude risk associations than earlier exposures: effect sizes were nearly 2-fold those for middle childhood and more than 3-fold those for earlier life. Effect sizes from the sibling comparison design were "far from trivial" but much smaller than those from a traditional between-family analysis (Figure 2B of Andersen's study). The author notes these results contrast with the "first 1000 days" narrative and with dynamic skill formation models predicting higher returns to early-childhood investment.
Methods
This is a commentary/editorial, not primary research; it summarizes and interprets Andersen's study. Andersen linked several Danish registers to track children born between 1987 and 1995 and their families from birth until age 19, testing household dysfunction ACE exposure during ages 0–2, 3–5, 6–12, and 13–17 years. ACE exposure was measured from records of parental unemployment, incarceration, psychiatric diagnoses, and divorce, plus foster care placement; transition-to-adulthood disruption was measured from records of education, employment, criminal charges, and psychiatric diagnoses. Andersen compared siblings in the same family exposed to household dysfunction at different developmental stages.
Limitations
Stated in the text: the register data captured household dysfunction dimensions of ACEs but not abuse or neglect, which may differ in their timing-outcome associations; the study population grew up in Denmark, a country with generous social welfare policies, so household dysfunction may not produce the same material deprivation as in settings like the United States, and direct policy implications are less clear where household dysfunction more often causes physical insults to development. Evident from the text: this piece is a commentary summarizing another study rather than an original empirical analysis, so its quantitative claims derive from Andersen's paper.
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Cites
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Claims the paper makes
0 of 15 cited sources checked · 0 supported · 0 flagged
- Premisecitation
One reason for an early childhood focus in intervention efforts is the concentration of critical periods in neurodevelopment in the first years of life.
“One reason for an earlychildhood focus in intervention efforts is the concentration of critical periods in neurodevelopment in the first years of life.5”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [5] source
Not checked in the free run.
- Interpretationown data
The findings are at odds with theoretical estimates from models of dynamic skill formation, which suggest that investments during early childhood should have higher returns than investments later in life.
“They are also at odds with theoretical estimates from models of dynamic skill formation, which suggest that investments during early childhood should have higher returns than investments later in life.3”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [3] source
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- Premiseown data
Adversity exposures during adolescence (ages 13-17 years) had larger magnitude risk associations compared with adversities that occurred earlier in development.
“Adversity exposures during adolescence (ages 13-17 years) had larger magnitude risk associations compared with adversities that occurred earlier in development.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [1] source
Not checked in the free run.
- Interpretationreasoning
Setting aside specific neurodevelopmental vulnerability, adolescence may also be thought of as a critical period in children's human capital development.
“Setting aside specific neurodevelopmental vulnerability, adolescence may also be thought of as a critical period in children's human capital development.”
Quote in the paperSubstantial claim- Rests on an assumption: Even small disruptions in academic performance can severely reduce access to postsecondary education and future economic opportunities.
- Premisecitation
Adolescence is a second critical period in neurodevelopment, characterized by experience-dependent plasticity affecting higher-order cognitive functions, including memory and self-control.
“New science suggests that adolescence is a second critical period in neurodevelopment, characterized by experience-dependent plasticity affecting higher-order cognitive functions, including memory and self-control.6”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [6]
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- Premiseown data
Andersen identified a dose-response association between accumulation of ACEs and increased likelihood of experiencing disruption to the transition to adulthood.
“Using this sibling comparison design, Andersen identified a dose-response association between accumulation of ACEs and increased likelihood of experiencing disruption to the transition to adulthood.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [1] source
Not checked in the free run.
- Interpretationreasoning
Andersen's results resonate with emerging research streams in both neuroscience and the social sciences to suggest that benefits of interventions in adolescence may be underappreciated.
“Andersen's results 1 resonate with emerging research streams in both neuroscience and the social sciences to suggest that benefits of interventions in adolescence may be underappreciated.”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [1] source
Not checked in the free run.
- Interpretationown data
The findings of stronger associations for exposures during adolescence contrast with the popular narrative of the first 1000 days as a unique window of opportunity to promote positive development.
“The findings of stronger associations for exposures during adolescence contrast with the popular narrative of the first 1000 days as a unique window of opportunity to promote positive development.2”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [2] source
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- Study design and conductreasoning
These data are less subject to bias that can arise if individuals with high levels of ACE exposure or those with more severe challenges during the transition to adulthood are less likely to participate in research.
“These data are less subject to bias that can arise if individuals with high levels of ACE exposure or those with more severe challenges during the transition to adulthood are less likely to participate in research.”
Quote in the paperSubstantial claim - Interpretationcitation
Her findings contribute to evidence that programs and policies that stabilize and strengthen families well beyond the first years of a child's life have potential to generate lasting benefits.
“Her findings contribute to evidence that programs and policies that stabilize and strengthen families well beyond the first years of a child's life have potential to generate lasting benefits.10”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [10]
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- Study design and conductcitation
Andersen's study used administrative records that prospectively recorded the ACE exposures of an entire nation's population of children across a series of birth cohorts.
“First, Andersen's study used administrative records that prospectively recorded the ACE exposures of an entire nation's population of children across a series of birth cohorts.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [1] source
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- Premisecitation
Interventions that specifically target the developmental vulnerabilities of adolescents can help them stay in school.
“Importantly, interventions that specifically target the developmental vulnerabilities of adolescents can help them stay in school.9”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [9]
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- Study design and conductreasoning
These data are not subject to the biases that can arise from selective recall of ACEs in retrospective studies or selective underreporting of ACEs in prospective studies.
“They are also not subject to the biases that can arise from selective recall of ACEs in retrospective studies or selective underreporting of ACEs in prospective studies.”
Quote in the paperSubstantial claim - Study design and conductcitation
The register data analyzed by Andersen captured household dysfunction dimensions of ACEs but not abuse or neglect.
“The register data analyzed by Andersen captured household dysfunction dimensions of ACEs but not abuse or neglect.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [1] source
Not checked in the free run.
- Study design and conductreasoning
Register data may provide greater precision in recording the specific timing of exposures, such as parental unemployment.
“In addition, register data may provide greater precision in recording the specific timing of exposures, such as parental unemployment.”
Quote in the paperSubstantial claim - Premisecitation
Changes in family economic circumstances have relatively larger associations with children's educational attainment when they occur during adolescence than when they occur earlier in childhood.
“One example is the observation that changes in family economic circumstances have relatively larger associations with children's educational attainment when they occur during adolescence than when they occur earlier in childhood.8”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [8] source
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- Study design and conductnone given
The sibling comparison design blocks confounding from all other exposures shared by siblings in the family, including characteristics of parents, neighborhoods, and the 50% of genetic variation shared by siblings.
“This design blocks confounding from all other exposures shared by siblings in the family, including characteristics of parents, neighborhoods, and the 50% of genetic variation shared by siblings.”
Quote in the paperSubstantial claim- Rests on an assumption: Confounding from risks shared within families is likely substantial.
- Study design and conductreasoning
Because of their size and scope, register data make analyses like Andersen's sibling comparisons possible.
“Furthermore, because of their size and scope, register data make analyses like Andersen's sibling comparisons possible.”
Quote in the paperSubstantial claim
- May combine two claims. 4
- Classified as probably not a substantial claim. 5
May combine two claims.
Premiseown dataEffect sizes for adolescent exposures were nearly 2-fold those for exposures in middle childhood and more than 3-fold those for exposures earlier in life.
“Effect sizes for adolescent exposures were nearly 2-fold those for exposures in middle childhood and more than 3-fold those for exposures earlier in life.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [1] source
Not checked in the free run.
May combine two claims.
PremisecitationEffect sizes from the sibling comparison design are far from trivial, but they are much smaller.
“Effect sizes from the sibling comparison design are far from trivial, but they are much smaller.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [1] source
Not checked in the free run.
Probably not a substantial claim: may not pass S2 (checkable). May combine two claims.
InterpretationreasoningAndersen's results highlight the importance of social and emotional consequences of household dysfunction and potential value of interventions that do more than ameliorate material disadvantage.
“Therefore, Andersen's results highlight the importance of social and emotional consequences of household dysfunction and potential value of interventions that do more than ameliorate material disadvantage.”
Quote in the paperNot a substantial claim- Rests on an assumption: Andersen studied children growing up in Denmark, a country with generous social welfare policies.
Classified as probably not a substantial claim.
InterpretationreasoningThe direct implications of Andersen's findings for program and policy design are less clear in settings where household dysfunction may more often result in physical insults to child development.
“At the same time, the direct implications of Andersen's findings for program and policy design are less clear in settings where household dysfunction may more often result in physical insults to child development.”
Quote in the paperSubstantial claim- Rests on an assumption: Andersen studied children growing up in Denmark, a country with generous social welfare policies.
Probably not a substantial claim: may not pass S2 (checkable).
InterpretationreasoningAndersen's analysis illustrates the potential of these administrative databases to inform understanding of how adversity shapes child development.
“Andersen's analysis illustrates the potential of these administrative databases to inform understanding of how adversity shapes child development.”
Quote in the paperNot a substantial claim- Rests on an assumption: Many nations have registers like Denmark's.
Probably not a substantial claim: may not pass S2 (checkable).
InterpretationreasoningWithin the context of Denmark and other countries with generous social welfare policies, Andersen's results have policy implications.
“Within the context of Denmark and other countries with generous social welfare policies, Anderson's results have policy implications.”
Quote in the paperNot a substantial claim- Rests on an assumption: Andersen studied children growing up in Denmark, a country with generous social welfare policies.
Classified as probably not a substantial claim.
InterpretationreasoningIn the context of Denmark, household dysfunction may not result in the same degree of material deprivation as in, for example, the United States.
“In this context, household dysfunction may not result in the same degree of material deprivation as in, for example, the United States.”
Quote in the paperSubstantial claim- Rests on an assumption: Andersen studied children growing up in Denmark, a country with generous social welfare policies.
May combine two claims.
PremisecitationDuring adolescence, heightened social sensitivity and increased sensation seeking coincide with tracking into differentiated academic curricula and the first option to drop out of school.
“During adolescence, heightened social sensitivity and increased sensation seeking 7 coincide with tracking into differentiated academic curricula and the first option to drop out of school.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [7] source
Not checked in the free run.
The paper relies on this without support.
Theories of development predict that the timing of adversity will affect its outcomes.
“Theories of development predict that the timing of adversity will affect its outcomes.”
The paper relies on this without support.
Empirical evidence for timing-specific effects remains scant.
“However, empirical evidence for timing-specific effects remains scant.”
The paper relies on this without support.
Robust development of higher-order cognitive functions is essential for a successful transition to adulthood and for health and wellbeing across adult life.
“Robust development of these higher-order cognitive functions is essential for a successful transition to adulthood and for health and wellbeing across adult life.”
The paper relies on this without support.
Even small disruptions in academic performance can severely reduce access to postsecondary education and future economic opportunities.
“Even small disruptions in academic performance can severely reduce access to postsecondary education and future economic opportunities.”
The paper relies on this without support.
Confounding from risks shared within families is likely substantial.
“Such confounding is likely substantial.”
The paper relies on this without support.
Many nations have registers like Denmark's.
“Many nations have registers like Denmark's.”
The paper relies on this without support.
Andersen studied children growing up in Denmark, a country with generous social welfare policies.
“Andersen studied children growing up in Denmark, a country with generous social welfare policies.”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
Social isolation during adolescence can exacerbate mental health problems.
“Indeed, adolescence is a critical period for not only social interaction (Larsen and Luna, 2018; ) but also the emergence of psychiatric diseases (Orben et al., 2020; Marco et al., 2011), and social isolation during adolescence can exacerbate mental health problems (Larsen and Luna, 2018; Almeida et al., 2021; ; Graf et al., 2021; Andersen, 2021).”
From Oxytocin neurons mediate the effect of social isolation via the VTA circuits (2022) · cites this paper as Graf et al., 2021
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Referenced author's name is inconsistent
MinorThe text twice identifies the author of study 1 as Anderson, but reference 1 names the author Andersen.
“Figure 2B in the study by Anderson 1 shows the contrast between the sibling comparison design and a traditional analysis that compares children in different families.”
“1. Andersen SH. Association of youth age at exposure to household dysfunction with outcomes in early adulthood.”
The citation lists haven’t been fetched yet
References 10 · Cited by 39
- Authors
- Graf, G. H.-J., Biroli, P., & Belsky, D. W.
- Affiliations
- Columbia University (US)
- University of Zurich (CH)
- Corresponding author
- Belsky, Daniel W.
- Venue
- JAMA Network Open
- Publisher
- American Medical Association (AMA)
- Published
- 2021-01-07
- Volume
- 4
- Issue
- 1
- Pages
- e2033359
- ISSN
- 2574-3805 (ISSN-L)
- OpenAlex
- W3119252144
- Semantic Scholar
- d7b532aca05a44c9383522af81b897bc999e231c
- Cited by
- 39
- References
- 10
- Citations by year
- 2026: 9 · 2025: 10 · 2024: 11 · 2023: 5 · 2022: 3 · 2021: 1
- FWCI
- 3.42
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- JAMA Network Open (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (submittedVersion, cc-by)
- Topics
- Social Sciences › Psychology › Clinical Psychology › Child Abuse and Trauma
- Social Sciences › Safety Research › Child Welfare and Adoption
- Social Sciences › Demography › Family Dynamics and Relationships
- Keywords
- adverse childhood experiences, critical period, coming of age, household dysfunction, parental unemployment, parental incarceration, parental divorce, foster care placement, educational attainment, employment, criminal charges, psychiatric diagnosis, human capital
- MeSH terms
- Adolescent, Adult, Child, Child Development, Family Characteristics, Humans
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