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Tanner, E. M., Unenge Hallerbäck, M., Wikström, S., Lindh, C., Kiviranta, H., Gennings, C. & Bornehag, C.-G. (2020). Early prenatal exposure to suspected endocrine disruptor mixtures is associated with lower IQ at age seven. Environment International, 134, 1-11, Article ID 105185.
Open this publication in new window or tab >>Early prenatal exposure to suspected endocrine disruptor mixtures is associated with lower IQ at age seven
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2020 (English)In: Environment International, ISSN 0160-4120, E-ISSN 1873-6750, Vol. 134, p. 1-11, article id 105185Article in journal (Refereed) Published
Abstract [en]

Background: Endocrine disrupting chemicals (EDCs) are xenobiotics with the ability to interfere with hormone action, even at low levels. Prior environmental epidemiology studies link numerous suspected EDCs, including phthalates and bisphenol A (BPA), to adverse neurodevelopmental outcomes. However, results for some chemicals were inconsistent and most assessed one chemical at a time.

Objectives: To evaluate the overall impact of prenatal exposure to an EDC mixture on neurodevelopment in school-aged children, and identify chemicals of concern while accounting for co-exposures.

Methods: Among 718 mother-child pairs from the Swedish Environmental Longitudinal, Mother and child, Asthma and allergy study (SELMA) study, we used Weighted Quantile Sum (WQS) regression to assess the association between 26 EDCs measured in 1st trimester urine or blood, with Wechsler Intelligence Scale for Children (IV) Intelligence Quotient (IQ) scores at age 7 years. Models were adjusted for child sex, gestational age, mother's education, mother's IQ (RAVEN), weight, and smoking status. To evaluate generalizability, we conducted repeated holdout validation, a machine learning technique.ResultsUsing repeated holdout validation, IQ scores were 1.9-points (CI = −3.6, −0.2) lower among boys for an inter-quartile-range (IQR) change in the WQS index. BPF made the largest contribution to the index with a weight of 14%. Other chemicals of concern and their weights included PBA (9%), TCP (9%), MEP (6%), MBzP (4%), PFOA (6%), PFOS (5%), PFHxS (4%), Triclosan (5%), and BPA (4%). While we did observe an inverse association between EDCs and IQ among all children when training and testing the WQS index estimate on the full dataset, these results were not robust to repeated holdout validation.

Conclusion: Among boys, early prenatal exposure to EDCs was associated with lower intellectual functioning at age 7. We identified bisphenol F as the primary chemical of concern, suggesting that the BPA replacement compound may not be any safer for children. Future studies are needed to confirm the potential neurotoxicity of replacement analogues.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Neurodevelopment, Replacement analogues, Chemical mixtures, Multipollutant, Repeated holdout validation, Uncertainty plot
National Category
Public Health, Global Health, Social Medicine and Epidemiology Occupational Health and Environmental Health
Research subject
Public Health Science
Identifiers
urn:nbn:se:kau:diva-75443 (URN)10.1016/j.envint.2019.105185 (DOI)000501344500028 ()2-s2.0-85075991242 (Scopus ID)
Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2020-05-27Bibliographically approved
Wikström, S., Lindh, C. H., Shu, H. & Bornehag, C.-G. (2019). Early pregnancy serum levels of perfluoroalkyl substances and risk of preeclampsia in Swedish women.. Scientific Reports, 9(1), 1-7, Article ID 9179.
Open this publication in new window or tab >>Early pregnancy serum levels of perfluoroalkyl substances and risk of preeclampsia in Swedish women.
2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, no 1, p. 1-7, article id 9179Article in journal (Refereed) Published
Abstract [en]

Preeclampsia is a major cause of maternal and fetal morbidity. Emerging research shows an association with environmental exposures. The present aim was to investigate associations between early pregnancy serum levels of perfluoroalkyl substances (PFAS) and preeclampsia. Within the Swedish SELMA study, eight PFAS were measured at median 10 gestational weeks and cases of preeclampsia were postnatally identified from registers. Associations between individual PFAS and preeclampsia were assessed, adjusting for parity, age, weight and smoking. Out of 1,773 women in the study group, 64 (3.6%), developed preeclampsia. A doubling of PFOS and PFNA exposure, corresponding to an inter-quartile increase, was associated with an increased risk for preeclampsia of about 38-53% respectively. Serum PFOS within the highest quartile was associated with an odds ratio of 2.68 (CI 95%: 1.17-6.12), equal to the increased risk associated with nulliparity, when compared to exposure in the first quartile. The same associations were identified, although with higher risk estimates, in analyses restricted to nulliparous women. For other PFAS, there were no associations. In conclusion and consistent with limited previous research only on PFOS, increasing serum levels of PFOS and PFNA during early pregnancy were associated with a clinically relevant risk of preeclampsia, adjusting for established confounders.

Place, publisher, year, edition, pages
Springer, 2019
National Category
Health Sciences
Research subject
Public Health Science
Identifiers
urn:nbn:se:kau:diva-73525 (URN)10.1038/s41598-019-45483-7 (DOI)31235847 (PubMedID)2-s2.0-85067898845 (Scopus ID)
Funder
Swedish Research Council FormasLandstinget i Värmland
Available from: 2019-07-08 Created: 2019-07-08 Last updated: 2019-07-15Bibliographically approved
Bornehag, C.-G., Reichenberg, A., Unenge Hallerbäck, M., Wikström, S., Koch, H. M., Jonsson, B. A. & Swan, S. H. (2018). Prenatal exposure to acetaminophen and children's language development at 30 months. European psychiatry, 51, 98-103
Open this publication in new window or tab >>Prenatal exposure to acetaminophen and children's language development at 30 months
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2018 (English)In: European psychiatry, ISSN 0924-9338, E-ISSN 1778-3585, Vol. 51, p. 98-103Article in journal (Refereed) Published
Abstract [en]

Objective: To examine prenatal APAP exposure in relation to language development in offspring at 30 months of age. Method: A population-based pregnancy cohort study including 754 women who enrolled in the Swedish Environmental Longitudinal, Mother and child, Asthma and allergy (SELMA) study in pregnancy week 8-13. Two exposure measures were used: (1) maternally reported number of APAP tablets taken between conception and enrollment; (2) APAP urinary concentration at enrollment. Language development at 30 months was assessed by nurse's evaluation and parental questionnaire, including the number of words the child used (<25, 25-50 and >50). Main study outcome; parental report of use of fewer than 50 words, termed language delay (LD). Results: 59.2% of women enrolled in weeks 8-13 reported taking APAP between conception and enrollment. APAP was measurable in all urine samples and urinary APAP was correlated with the number of APAP taken during pregnancy (P < 0.01). Language delay was more prevalent in boys (12.6%) than girls (4.1%) (8.5% in total). Both the number of APAP tablets and urinary APAP concentration were associated with greater LD in girls but not in boys. The adjusted odds ratio (OR) for LD among girls whose mothers reported >6 vs. 0 APAP tablets was 5.92 (95% confidence interval (CI) 1.10-31.94). The OR for LD in girls whose mothers' urinary APAP was in the highest compared to the lowest quartile was 10.34 (95% CI 1.37-77.86). While it cannot be ruled out, our available data do not support confounding by indication. Conclusions: Given the prevalence of prenatal APAP use and the importance of language development, these findings, if replicated, would suggest that pregnant women should limit their use of this analgesic during pregnancy. (C) 2017 Elsevier Masson SAS. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Research subject
Public Health Science
Identifiers
urn:nbn:se:kau:diva-68398 (URN)10.1016/j.eurpsy.2017.10.007 (DOI)000434683700015 ()29331486 (PubMedID)
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-07-05Bibliographically approved
Bornehag, C.-G., Reichenberg, A., Unenge Hallerbäck, M., Wikström, S., Koch, H. M. & Swan, S. H. (2018). Reply to Shukla et al., Commentary on: Prenatal exposure to acetaminophen and children's language development at 30 months [Letter to the editor]. European psychiatry, 51, 86-86
Open this publication in new window or tab >>Reply to Shukla et al., Commentary on: Prenatal exposure to acetaminophen and children's language development at 30 months
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2018 (English)In: European psychiatry, ISSN 0924-9338, E-ISSN 1778-3585, Vol. 51, p. 86-86Article in journal, Letter (Refereed) Published
Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Research subject
Public Health Science
Identifiers
urn:nbn:se:kau:diva-67362 (URN)10.1016/j.eurpsy.2018.03.004 (DOI)000434683700012 ()2-s2.0-85046463129 (Scopus ID)
Note

DOI till originalartikeln: https://doi.org/10.1016/j.eurpsy.2017.10.007

Available from: 2018-05-24 Created: 2018-05-24 Last updated: 2018-07-05Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-4088-9951

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