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Within-Day, Between-Day, and Between-Week Variability of Urinary Concentrations of Phenol Biomarkers in Pregnant Women.
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- Author(s): Vernet, Céline1 ; Philippat, Claire1; Calafat, Antonia M.2; Xiaoyun Ye2; Lyon-Caen, Sarah1; Siroux, Valérie1; Schisterman, Enrique F.3; Slama, Rémy1
- Source:
Environmental Health Perspectives. Mar2018, Vol. 126 Issue 3, p1-12. 12p. 1 Diagram, 5 Charts, 4 Graphs.- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: BACKGROUND: Toxicology studies have shown adverse effects of developmental exposure to industrial phenols. Evaluation in humans is challenged by potentially marked within-subject variability of phenol biomarkers in pregnant women, which is poorly characterized. OBJECTIVES: We aimed to characterize within-day, between-day, and between-week variability of phenol urinary biomarker concentrations during pregnancy. METHODS: In eight French pregnant women, we collected all urine voids over a 1-wk period (average, 60 samples per week per woman) at three occasions (15±2, 24±2, and 32±1 gestational weeks) in 2012-2013. Aliquots of each day and of the whole week were pooled within-subject. We assayed concentrations of 10 phenols in these pools, and, for two women, in all spot (unpooled) samples collected during a 1-wk period. We characterized variability using intraclass correlation coefficients (ICCs) with spot samples (within-day variability), daily pools (between-day variability), and weekly pools (between-week variability). RESULTS: For most biomarkers, the within-day variability was high (ICCs between 0.03 and 0.50). The between-day variability, based on samples pooled within each day, was much lower, with ICCs >0:60 except for bisphenol S (0.14, 95% confidence interval [CI]: 0.00, 0.39). The betweenweek variability differed between compounds, with triclosan and bisphenol S having the lowest ICCs (<0:3) and 2,5-dichlorophenol the highest (ICC >0:9). CONCLUSION: During pregnancy, phenol biomarkers showed a strong within-day variability, while the variability between days of a given week was more limited. One biospecimen is not enough to efficiently characterize exposure; collecting biospecimens during a single week may be enough to represent well the whole pregnancy exposure for some but not all phenols. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Environmental Health Perspectives is the property of National Institute of Environmental Health Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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