Publications by authors named "Ruby H N Nguyen"

Problem/condition: Autism spectrum disorder (ASD).

Period Covered: 2022.

Description Of System: The Autism and Developmental Disabilities Monitoring Network is an active surveillance program that estimates prevalence and characteristics of ASD and monitors timing of ASD identification among children aged 4 and 8 years.

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Emerging but inconsistent evidence suggests that glyphosate (GLY)-based herbicides (GBHs) are more toxic than the active ingredient, GLY alone. Polyoxyethylene tallow amines (POEAs) are surfactants most widely used in GBH formulations, making up to 5-15 % by weight. However, neither POEA exposure nor their toxicity has been well studied in the general population.

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Importance: Ozone (O3) is the most frequently exceeded air pollutant standard in the US. While short-term exposure is associated with acute respiratory health, the epidemiologic evidence linking postnatal O3 exposure to childhood asthma and wheeze is inconsistent and rarely evaluated as a mixture with other air pollutants.

Objectives: To determine associations between ambient O3 and subsequent asthma and wheeze outcomes both independently and in mixture with fine particulate matter and nitrogen dioxide in regions with low annual O3 concentrations.

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Background: Phthalate exposure during pregnancy has been associated with preterm birth, but mechanisms of action may depend on the timing of exposure.

Objective: Investigate critical periods of susceptibility during pregnancy for associations between urinary phthalate metabolite concentrations and preterm birth.

Methods: Individual-level data were pooled from 16 US cohorts (N = 6045, n = 539 preterm births).

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Our study aimed to assess the impact of political affiliation, personal beliefs, and policy measures on the intention to receive routine COVID-19 and influenza vaccines in the coming year. A cross-sectional study of 1256 individuals at Minnesota State and County Fairs was conducted to assess their intention to receive COVID-19 booster and influenza vaccines in the coming year. The association between vaccine intention and political affiliation, belief in collective responsibility, and workplace/school vaccine requirements were analyzed using multinomial logistic regression.

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Objective: Prenatal exposure to polycyclic aromatic hydrocarbons (PAHs) is associated with adverse birth and developmental outcomes in children. We aimed to describe prenatal PAH exposures in a large, multisite U.S.

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Article Synopsis
  • Executive functions, crucial for problem-solving and planning, develop rapidly in childhood, but prenatal exposure to environmental toxicants like polycyclic aromatic hydrocarbons (PAHs) may hinder this development.
  • The study analyzed 814 children from non-smoking mothers, measuring urine levels of PAH metabolites during pregnancy and evaluating their executive functions at age 8-9, focusing on cognitive flexibility, working memory, and inhibitory control.
  • Results showed mostly null associations between PAH exposure and executive functions, although some interactions between specific PAH metabolites and working memory were observed, highlighting the need for further research in this area.
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  • The study investigates the impact of early childhood air pollution on executive function in school-aged children, using data from 1235 participants across three US pregnancy cohorts.
  • It examines the effects of pollutants like PM 2.5, nitrogen dioxide (NO2), and ozone (O3) during the ages of 0-4, assessing various cognitive abilities such as working memory and cognitive flexibility.
  • Results suggest that air pollution exposure, particularly NO2, negatively affects executive function, with stronger effects observed in areas with higher educational opportunities; further research is needed to deepen understanding of these environmental influences on child development.
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We examined associations between prenatal fine particulate matter (PM), nitrogen dioxide (NO), and ozone (O) exposures and child respiratory outcomes through age 8-9 years in 1279 ECHO-PATHWAYS Consortium mother-child dyads. We averaged spatiotemporally modeled air pollutant exposures during four fetal lung development phases: pseudoglandular (5-16 weeks), canalicular (16-24 weeks), saccular (24-36 weeks), and alveolar (36+ weeks). We estimated adjusted relative risks (RR) for current asthma at age 8-9 and asthma with recent exacerbation or atopic disease, and odds ratios (OR) for wheezing trajectories using modified Poisson and multinomial logistic regression, respectively.

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Article Synopsis
  • This study examined the effects of prenatal exposure to polycyclic aromatic hydrocarbons (PAHs) on asthma and wheezing in children aged 8-9, using data from a diverse sample of 1,081 parent-child pairs across five U.S. cities.! -
  • Researchers measured levels of PAH metabolites in mothers during mid-pregnancy and assessed asthma and wheezing symptoms in children, adjusting for various factors like smoke exposure and demographics.! -
  • The findings revealed limited evidence linking prenatal PAH exposure to asthma or wheezing trajectories, with some associations noted for specific compounds in boys and girls, but no strong overall connections were established.
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Placental corticotropin-releasing hormone (pCRH) is a neuroactive peptide produced in high concentrations in mid-late pregnancy, during key periods of fetal brain development. Some evidence suggests that higher pCRH exposure during gestation is associated with adverse neurodevelopment, particularly in female offspring. In 858 mother-child dyads from the sociodemographically diverse CANDLE cohort (Memphis, TN), we examined: (1) the slope of pCRH rise in mid-late pregnancy and (2) estimated pCRH at delivery as a measure of cumulative prenatal exposure.

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Article Synopsis
  • A study aimed to identify clusters of chronic obesity-related, neurodevelopmental, and respiratory issues in children, examining how these clusters relate to chemical exposure.
  • Researchers analyzed data from 1092 children collected between 2011 and 2022 across three pregnancy cohorts and identified three distinct health outcome clusters based on k-means clustering.
  • A significant association was found between exposure to certain phthalates and membership in a cluster with high rates of asthma and other respiratory problems, suggesting shared underlying causes for these health outcomes.
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Article Synopsis
  • Prenatal exposure to chemicals like phthalates and psychosocial stressors may affect the developing brain, but their combined effects are not well studied.
  • Researchers analyzed data from three pregnancy cohorts, measuring phthalates in urine and mothers' reported stressful life events during pregnancy, to see how these factors impacted children's problem behaviors at ages 4-6.
  • The study found some weak links between phthalate exposure and behavior issues, with unexpected results showing that higher stress levels during pregnancy might lessen the impact of certain phthalates on child behaviors, especially in boys, indicating a need for further investigation.
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Background: Phthalate exposures are ubiquitous during pregnancy and may contribute to racial and ethnic disparities in preterm birth.

Objectives: We investigated race and ethnicity in the relationship between biomarkers of phthalate exposure and preterm birth by examining: ) how hypothetical reductions in racial and ethnic disparities in phthalate metabolites might reduce the probability of preterm birth; and ) exposure-response models stratified by race and ethnicity.

Methods: We pooled individual-level data on 6,045 pregnancies from 16 U.

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Article Synopsis
  • The study investigates the impact of ambient air pollution on anogenital distance (AGD), an indicator of androgen activity, in infants.
  • Exposure to fine particulate matter (PM) and nitrogen dioxide (NO2) during critical developmental windows showed varied effects on male AGD at birth and one year of age.
  • In males, increased PM exposure during prenatal and early postnatal periods was linked to shorter AGD at birth but longer AGD at one year; NO2 exposure appeared to have negative effects on penile width.
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Background And Aim: Studies suggest prenatal exposure to polycyclic aromatic hydrocarbons (PAHs) may influence wheezing or asthma in preschool-aged children. However, the impact of prenatal PAH exposure on asthma and wheeze in middle childhood remain unclear. We investigated these associations in diverse participants from the ECHO PATHWAYS multi-cohort consortium.

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Article Synopsis
  • This study examined the link between prenatal exposure to polycyclic aromatic hydrocarbons (PAHs) and child cognitive outcomes, specifically IQ, using data from two large pregnancy cohorts involving over 1,200 mother-child pairs.
  • Although individual PAH metabolites didn't show a significant connection to IQ overall, one specific metabolite (2-hydroxynaphthalene) indicated sex differences, negatively affecting IQ in males while showing a positive association in females.
  • The findings suggest minimal adverse effects of early pregnancy PAH exposure on child IQ, with pooled analyses showing no significant impact.
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Problem/condition: Autism spectrum disorder (ASD).

Period Covered: 2020.

Description Of System: The Autism and Developmental Disabilities Monitoring Network is an active surveillance program that estimates prevalence and characteristics of ASD and monitors timing of ASD identification among children aged 4 and 8 years.

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Problem/condition: Autism spectrum disorder (ASD).

Period Covered: 2020.

Description Of System: The Autism and Developmental Disabilities Monitoring (ADDM) Network is an active surveillance program that provides estimates of the prevalence of ASD among children aged 8 years.

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Background: Atopic disease may be influenced by prenatal and early life exposure to endocrine disrupting chemicals, including bisphenols, but results from epidemiological studies have been mixed. This study aimed to extend the epidemiological literature, hypothesizing that children with higher prenatal bisphenol exposure are more likely to have childhood atopic disease.

Methods: Urinary bisphenol A (BPA) and S (BPS) concentrations were measured in each trimester from 501 pregnant women in a multi-center, prospective pregnancy cohort.

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