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1.
  • Fall, Tove, et al. (författare)
  • Early Exposure to Dogs and Farm Animals and the Risk of Childhood Asthma
  • 2015
  • Ingår i: JAMA pediatrics. - Stockholm : American Medical Association. - 2168-6203 .- 2168-6211. ; 169:11
  • Tidskriftsartikel (refereegranskat)abstract
    • IMPORTANCE: The association between early exposure to animals and childhood asthma is not clear, and previous studies have yielded contradictory results.OBJECTIVE: To determine whether exposure to dogs and farm animals confers a risk of asthma.DESIGN, SETTING AND PARTICIPANTS: In a nationwide cohort study, the association between early exposure to dogs and farm animals and the risk of asthma was evaluated and included all children born in Sweden from January 1, 2001, to December 31, 2010 (N = 1 011 051), using registry data on dog and farm registration, asthma medication, diagnosis, and confounders for parents and their children. The association was assessed as the odds ratio (OR) for a current diagnosis of asthma at age 6 years for school-aged children and as the hazard ratio (HR) for incident asthma at ages 1 to 5 years for preschool-aged children. Data were analyzed from January 1, 2007, to September 30, 2012.EXPOSURES: Living with a dog or farm animal.MAIN OUTCOMES AND MEASURES: Childhood asthma diagnosis and medication used.RESULTS: Of the 1 011 051 children born during the study period, 376 638 preschool-aged (53 460 [14.2%] exposed to dogs and 1729 [0.5%] exposed to farm animals) and 276 298 school-aged children (22 629 [8.2%] exposed to dogs and 958 [0.3%] exposed to farm animals) were included in the analyses. Of these, 18 799 children (5.0%) in the preschool-aged children's cohort experienced an asthmatic event before baseline, and 28 511 cases of asthma and 906 071 years at risk were recorded during follow-up (incidence rate, 3.1 cases per 1000 years at risk). In the school-aged children's cohort, 11 585 children (4.2%) experienced an asthmatic event during the seventh year of life. Dog exposure during the first year of life was associated with a decreased risk of asthma in school-aged children (OR, 0.87; 95% CI, 0.81-0.93) and in preschool-aged children 3 years or older (HR, 0.90; 95% CI, 0.83-0.99) but not in children younger than 3 years (HR, 1.03; 95% CI, 1.00-1.07). Results were comparable when analyzing only first-born children. Farm animal exposure was associated with a reduced risk of asthma in both school-aged children and preschool-aged children (OR, 0.48; 95% CI, 0.31-0.76, and HR, 0.69; 95% CI, 0.56-0.84), respectively.CONCLUSIONS AND RELEVANCE: In this study, the data support the hypothesis that exposure to dogs and farm animals during the first year of life reduces the risk of asthma in children at age 6 years. This information might be helpful in decision making for families and physicians on the appropriateness and timing of early animal exposure.
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2.
  • Öberg, Anna Sara, et al. (författare)
  • Association of labor induction with offspring risk of autism spectrum disorders
  • 2017
  • Ingår i: JAMA Pediatrics. - Stockholm : Karolinska Institutet, Dept of Medical Epidemiology and Biostatistics. - 2168-6203 .- 2168-6211.
  • Tidskriftsartikel (refereegranskat)abstract
    • IMPORTANCE: Induction of labor is a frequently performed obstetrical intervention. It would thus be of great concern if reported associations between labor induction and offspring risk of autism spectrum disorders (ASD) reflected causal influence. OBJECTIVE: To assess the associations of labor induction with ASD, comparing differentially exposed relatives (siblings and cousins discordant for induction). DESIGN, SETTING, AND PARTICIPANTS: Follow-up of all live births in Sweden between 1992 and 2005, defined in the Medical Birth Register. The register was linked to population registers of familial relations, inpatient and outpatient visits, and education records. Diagnoses of ASD were from 2001 through 2013, and data were analyzed in the 2015-2016 year. EXPOSURES: Induction of labor. MAIN OUTCOMES AND MEASURES: Autism spectrum disorders identified by diagnoses from inpatient and outpatient records between 2001 and 2013. Hazard ratios (HRs) quantified the association between labor induction and offspring ASD. In addition to considering a wide range of measured confounders, comparison of exposure-discordant births to the same woman allowed additional control for all unmeasured factors shared by siblings. RESULTS: The full cohort included 1362950 births, of which 22077 offspring (1.6%) were diagnosed with ASD by ages 8 years through 21 years. In conventional models of the full cohort, associations between labor induction and offspring ASD were attenuated but remained statistically significant after adjustment for measured potential confounders (HR, 1.19; 95% CI, 1.13-1.24). When comparison was made within siblings whose births were discordant with respect to induction, thus accounting for all environmental and genetic factors shared by siblings, labor induction was no longer associated with offspring ASD (HR, 0.99; 95% CI, 0.88-1.10). CONCLUSIONS AND RELEVANCE: In this nationwide sample of live births we observed no association between induction of labor and offspring ASD within sibling comparison. Our findings suggest that concern for ASD should not factor into the clinical decision about whether to induce labor.
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4.
  • Ancel, PY, et al. (författare)
  • Error in group information and figure
  • 2015
  • Ingår i: JAMA pediatrics. - : American Medical Association (AMA). - 2168-6211 .- 2168-6203. ; 169:4, s. 323-323
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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6.
  • Andersson, Ola, et al. (författare)
  • Effect of Delayed Cord Clamping on Neurodevelopment at 4 Years of Age : A Randomized Clinical Trial
  • 2015
  • Ingår i: JAMA pediatrics. - : American Medical Association (AMA). - 2168-6203 .- 2168-6211. ; 169:7, s. 631-638
  • Tidskriftsartikel (refereegranskat)abstract
    • IMPORTANCE Prevention of iron deficiency in infancy may promote neurodevelopment. Delayuci umbilical cord clamping (CC) prevents iron deficiency at 4 to 6 months of age, but long-term effects after 12 months of age have not been reported. OBJECTIVE To investigate the effects of delayed CC compared with early CC on neurodevelopment at 4 years of age. DESIGN, SETTING, AND PARTICIPANTS Follow-up of a randomized clinical trial conducted from April 16, 2008, through May 21, 2010, at a Swedish county hospital. Children who were included in the original study (n = 382) as full-term infants born after a low-risk pregnancy were invited to return for follow-up at 4 years of age. Wechsler Preschool and Primary Scale of Intelligence (WPPSI-111) and Movement Assessment Battery for Children (Movement ABC) scores (collected between April 18, 2012, and July 5, 2013) were assessed by a blinded psychologist. Between April 11, 2012, and August 13, 2013, parents recorded their child's development using the Ages and Stages Questionnaire, Third Edition (ASQ) and behavior using the Strengths and Difficulties Questionnaire. All data were analyzed by intention to treat. INTERVENTIONS Randomization to delayed CC (>= 180 seconds after delivery) or early CC (<= 10 seconds after delivery). MAIN OUTCOMES AND MEASURES The main outcome was full-scale IQ as assessed by the were development as assessed by the scales from the WPPSI-III and Movement ABC, development as recorded using the ASQ, and behavior using the Strengths and Difficulties Questionnaire. RESULTS We assessed 263 children (68.8%). No differences were found in WPPSI-III scores between groups. Delayed CC improved the adjusted mean differences (AMDs) in the ASQ personal-social (AMD, 2.8; 95% Cl, 0.8-4.7) and fine-motor (AMD, 2.1; 95% Cl, 0.2-4.0) domains and the Strengths and Difficulties Questionnaire prosocial subscale (AMD, 0.5; 95% Cl, >0.0-0.9). Fewer children in the delayed-CC group had results below the cutoff in the ASQ fine-motor domain (11.0% vs 3.7%; P =.02) and the Movement ABC bicycle-trail task (12.9% vs 3.8%; P =.02). Boys who received delayed CC had significantly higher AMDs in the WPPSI-III processing-speed quotient (AMD, 4.2; 95% Cl, 0.8-7.6; P =.02), Movement ABC bicycle-trail task (AMD, 0.8; 95% Cl, 0.1-1.5; P =.03), and fine-motor (AMD, 4.7; 95% Cl, 1.0-8.4; P =.01) and personal-social (AMD, 4.9; 95% Cl, 1.6-8.3; P =.004) domains of the ASQ. CONCLUSIONS AND RELEVANCE Delayed CC compared with early CC improved scores in the fine-motor at 4 years of age, especially in boys, indicating that optimizing the time to CC may affect neurodevelopment in a low-risk population of children born in a high-income country.
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7.
  • Beckley, Amber, 1981-, et al. (författare)
  • Association of childhood blood lead levels with criminal offending
  • 2018
  • Ingår i: JAMA pediatrics. - : American Medical Association (AMA). - 2168-6203 .- 2168-6211. ; 172:2, s. 166-173
  • Tidskriftsartikel (refereegranskat)abstract
    • Importance:  Lead is a neurotoxin with well-documented effects on health. Research suggests that lead may be associated with criminal behavior. This association is difficult to disentangle from low socioeconomic status, a factor in both lead exposure and criminal offending.Objective:  To test the hypothesis that a higher childhood blood lead level (BLL) is associated with greater risk of criminal conviction, recidivism (repeat conviction), conviction for violent offenses, and variety of self-reported criminal offending in a setting where BLL was not associated with low socioeconomic status.Design, Setting, and Participants:  A total of 553 individuals participated in a prospective study based on a population-representative cohort born between April 1, 1972, and March 31, 1973, from New Zealand; the Dunedin Multidisciplinary Health and Development Study observed participants to age 38 years (December 2012). Statistical analysis was performed from November 10, 2016, to September 5, 2017.Exposures:  Blood lead level measured at age 11 years.Main Outcomes and Measures:  Official criminal conviction cumulative to age 38 years (data collected in 2013), single conviction or recidivism, conviction for nonviolent or violent crime, and self-reported variety of crime types at ages 15, 18, 21, 26, 32, and 38 years.Results: Participants included 553 individuals (255 female and 298 male participants) who had their blood tested for lead at age 11 years. The mean (SD) BLL at age 11 years was 11.01 (4.62) μg/dL. A total of 154 participants (27.8%) had a criminal conviction, 86 (15.6%) had recidivated, and 53 (9.6%) had a violent offense conviction. Variety scores for self-reported offending ranged from 0 to 10 offense types at each assessment; higher numbers indicated greater crime involvement. Self-reported offending followed the well-established age-crime curve (ie, the mean [SD] variety of self-reported offending increased from 1.99 [2.82] at age 15 years to its peak of 4.24 [3.15] at age 18 years and 4.22 [3.02] at age 21 years and declined thereafter to 1.10 [1.59] at age 38 years). Blood lead level was a poor discriminator between no conviction and conviction (area under the curve, 0.58). Overall, associations between BLL and conviction outcomes were weak. The estimated effect of BLL was lower for recidivism than for single convictions and lower for violent offending than for nonviolent offending. Sex-adjusted associations between BLL reached statistical significance for only 1 of the 6 self-reported offending outcomes at age 15 years (r = 0.10; 95% CI, 0.01-0.18; P = .02).Conclusions and Relevance:  This study overcomes past limitations of studies of BLL and crime by studying the association in a place and time where the correlation was not confounded by childhood socioeconomic status. Findings failed to support a dose-response association between BLL and consequential criminal offending.
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8.
  • Beckley, Amber L., et al. (författare)
  • Association of Childhood Blood Lead Levels With Criminal Offending
  • 2018
  • Ingår i: JAMA pediatrics. - : American Medical Association (AMA). - 2168-6203 .- 2168-6211. ; 172:2, s. 166-173
  • Tidskriftsartikel (refereegranskat)abstract
    • Importance  Lead is a neurotoxin with well-documented effects on health. Research suggests that lead may be associated with criminal behavior. This association is difficult to disentangle from low socioeconomic status, a factor in both lead exposure and criminal offending.Objective  To test the hypothesis that a higher childhood blood lead level (BLL) is associated with greater risk of criminal conviction, recidivism (repeat conviction), conviction for violent offenses, and variety of self-reported criminal offending in a setting where BLL was not associated with low socioeconomic status.Design, Setting, and Participants  A total of 553 individuals participated in a prospective study based on a population-representative cohort born between April 1, 1972, and March 31, 1973, from New Zealand; the Dunedin Multidisciplinary Health and Development Study observed participants to age 38 years (December 2012). Statistical analysis was performed from November 10, 2016, to September 5, 2017.Exposures  Blood lead level measured at age 11 years.Main Outcomes and Measures  Official criminal conviction cumulative to age 38 years (data collected in 2013), single conviction or recidivism, conviction for nonviolent or violent crime, and self-reported variety of crime types at ages 15, 18, 21, 26, 32, and 38 years.Results  Participants included 553 individuals (255 female and 298 male participants) who had their blood tested for lead at age 11 years. The mean (SD) BLL at age 11 years was 11.01 (4.62) μg/dL. A total of 154 participants (27.8%) had a criminal conviction, 86 (15.6%) had recidivated, and 53 (9.6%) had a violent offense conviction. Variety scores for self-reported offending ranged from 0 to 10 offense types at each assessment; higher numbers indicated greater crime involvement. Self-reported offending followed the well-established age-crime curve (ie, the mean [SD] variety of self-reported offending increased from 1.99 [2.82] at age 15 years to its peak of 4.24 [3.15] at age 18 years and 4.22 [3.02] at age 21 years and declined thereafter to 1.10 [1.59] at age 38 years). Blood lead level was a poor discriminator between no conviction and conviction (area under the curve, 0.58). Overall, associations between BLL and conviction outcomes were weak. The estimated effect of BLL was lower for recidivism than for single convictions and lower for violent offending than for nonviolent offending. Sex-adjusted associations between BLL reached statistical significance for only 1 of the 6 self-reported offending outcomes at age 15 years (r = 0.10; 95% CI, 0.01-0.18; P = .02).Conclusions and Relevance  This study overcomes past limitations of studies of BLL and crime by studying the association in a place and time where the correlation was not confounded by childhood socioeconomic status. Findings failed to support a dose-response association between BLL and consequential criminal offending.
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9.
  • Bolk, J., et al. (författare)
  • Developmental Coordination Disorder and Its Association With Developmental Comorbidities at 6.5 Years in Apparently Healthy Children Born Extremely Preterm
  • 2018
  • Ingår i: Jama Pediatrics. - : American Medical Association (AMA). - 2168-6203 .- 2168-6211. ; 172:8, s. 765-774
  • Tidskriftsartikel (refereegranskat)abstract
    • IMPORTANCE There are concerns that apparently healthy extremely preterm children face a risk of developing motor impairments, such as developmental coordination disorder. OBJECTIVE To evaluate the prevalence of developmental coordination disorder and associated comorbidities in a national cohort of apparently healthy children born at 22 to 26 gestational weeks, compared alongside term-born peers. DESIGN, SETTING, AND PARTICIPANTS This prospective, population-based cohort study included all children who were consecutively born at 22 to 26 gestational weeks in Sweden from April 1, 2004, through March 31, 2007. At 6.5 years, 441 preterm children were evaluated alongside 371 controls. A total of 275 preterm children (62.4%) and 359 term-born children (96.8%) did not have neurodevelopmental disabilities. Motor assessments were completed for 229 of 275 preterm children (83.3%) and 344 of 359 (95.8%) term-born children, who composed the final study sample. MAIN OUTCOMES AND MEASURES Developmental coordination disorder was defined as a score of the fifth percentile or lower on the Movement Assessment Battery for Children-Second Edition scale, using control group scores. Assessment tools included the Wechsler Intelligence Scale for Children-Fourth Edition, the Brown Attention-Deficit Disorder Scales, the Five to Fifteen questionnaire, and the Strengths and Difficulties questionnaire. RESULTS Of the 229 extremely preterm children and 344 term-born controls who underwent motor assessments, 115 (50.2%) and 194 (56.4%) were boys, respectively. Developmental coordination disorder was present in 85 of 229 (37.1%) preterm children and in 19 of 344 controls (5.5%) (adjusted odds ratio [OR], 7.92; 99% CI, 3.69-17.20). When preterm children with developmental coordination disorder were compared with term-born peers, the risk was increased for total behavioral problems, internalizing, externalizing, attentional problems, hyperactivity, perceptual problems, executive dysfunction, and poor social skills, with adjusted ORs varying from 2.66 (99% CI, 1.09-6.48) for time concepts to 9.06 (99% CI, 3.60-22.8) for attentional problems (all P < .01). When preterm children with and without developmental coordination disorder were compared, preterm children with developmental coordination disorder had more behavioral problems; the adjusted OR for total behavioral problems was 2.71 (99% CI, 1.15-6.37); for externalizing problems, 2.80 (99% CI, 1.10-7.12); for inattention, 3.38 (99% CI, 1.39-8.18); and for combined attention/hyperactivity problems, 3.68 (99% CI, 1.47-9.16) (all P < .01). Parents underestimated the children's motor problems and only a few of the children had received psychological care or physiotherapy. CONCLUSIONS AND RELEVANCE Children who were born extremely preterm faced a high risk for developmental coordination disorder with associated comorbidities. Our findings support the importance of a structured follow-up of motor function, behavior, and cognition. (C) 2018 American Medical Association. All rights reserved.
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10.
  • Bornehag, Carl-Gustaf, 1957-, et al. (författare)
  • Association of Prenatal Phthalate Exposure with Language Development in Early Childhood
  • 2018
  • Ingår i: JAMA pediatrics. - : American Medical Association. - 2168-6203 .- 2168-6211. ; 172:12, s. 1169-1176
  • Tidskriftsartikel (refereegranskat)abstract
    • Importance: Prenatal exposure to phthalates has been associated with neurodevelopmental outcomes, but little is known about the association with language development. Objective: To examine the association of prenatal phthalate exposure with language development in children in 2 population-based pregnancy cohort studies. Design, Setting, and Participants: Data for this study were obtained from the Swedish Environmental Longitudinal Mother and Child, Asthma and Allergy (SELMA) study conducted in prenatal clinics throughout Värmland county in Sweden and The Infant Development and the Environment Study (TIDES) conducted in 4 academic centers in the United States. Participants recruited into both studies were women in their first trimester of pregnancy who had literacy in Swedish (SELMA) or English or Spanish (TIDES). This study included mothers and their children from both the SELMA study (n = 963) and TIDES (n = 370) who had complete data on prenatal urinary phthalate metabolite levels, language delay, and modeled covariables. For SELMA, the data were collected from November 1, 2007, to June 30, 2013, and data analysis was conducted from November 1, 2016, to June 30, 2018. For TIDES, data collection began January 1, 2010, and ended March 29, 2016, and data analysis was performed from September 15, 2016, to June 30, 2018. Main Outcomes and Measures: Mothers completed a language development questionnaire that asked the number of words their children could understand or use at a median of 30 months of age (SELMA) and 37 months of age (TIDES). The responses were categorized as fewer than 25, 25 to 50, and more than 50 words, with 50 words or fewer classified as language delay. Results: In the SELMA study, 963 mothers, 455 (47.2%) girls, and 508 [52.8%] boys were included. In TIDES, 370 mothers, 185 (50.0%) girls, and 185 (50.0%) boys were included in this analysis. The prevalence of language delay was 10.0% in both SELMA (96 reported) and TIDES (37 reported), with higher rates of delay in boys than girls (SELMA: 69 [13.5%] vs 27 [6.0%]; TIDES: 12 [12.4%] vs 14 [7.6%]). In crude analyses, the metabolite levels of dibutyl phthalate and butyl benzyl phthalate were statistically significantly associated with language delay in both cohorts. In adjusted analyses, a doubling of prenatal exposure of dibutyl phthalate and butyl benzyl phthalate metabolites increased the odds ratio (OR) for language delay by approximately 25% to 40%, with statistically significant results in the SELMA study (dibutyl phthalate OR, 1.29 [95% CI, 1.03-1.63; P =.03]; butyl benzyl phthalate OR, 1.26 [95% CI, 1.07-1.49; P =.003]). A doubling of prenatal monoethyl phthalate exposure was associated with an approximately 15% increase in the OR for language delay in the SELMA study (OR, 1.14; 95% CI, 1.00-1.31; P =.05), but no such association was found in TIDES (OR, 0.98; 95% CI, 0.79-1.23). Conclusions and Relevance: In findings from this study, prenatal exposure to dibutyl phthalate and butyl benzyl phthalate was statistically significantly associated with language delay in children in both the SELMA study and TIDES. These findings, along with the prevalence of prenatal exposure to phthalates, the importance of language development, and the inconsistent results from a 2017 Danish study, suggest that the association of phthalates with language delay may warrant further examination.
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