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The association of phthalate metabolites with childhood waist circumference and abdominal obesity

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Abstract

The association between phthalates exposure and childhood abdominal obesity is still unclear. This study aimed to assess phthalates (PAEs) exposure level and explore the association between PAEs metabolites exposure and the risk of abdominal obesity in Chinese students aged 7–10 years. A total of 798 students aged 7–10 years were selected from the baseline survey of the cohort of Childhood Blood Pressure and Environmental Factors (CBPEF), which was established in Xiamen City, Fujian province, East China, from August to November in 2018. Urine samples were collected from these students to analyze the concentrations of seven PAEs metabolites using the method of high-performance liquid chromatography–tandem triple quadrupole mass spectrometry. Waist circumference was used to define abdominal obesity. The logistic regression model was used to analyze the association of urinary creatinine-adjusted PAEs metabolites with childhood abdominal obesity risk. The prevalence of childhood abdominal obesity is 12.0% (96/798). Apart from mono(2-ethylhexyl) phthalate (62.5% for boys and 47.0% for girls), the detection rate of the others PAEs metabolites ranged from 82.6 to 100%. Boys had higher concentrations of PAEs metabolites than girls (P < 0.05), except for monoethyl phthalate. Compared with the Q1 group of PAEs metabolites, the risk of childhood abdominal obesity increased to 429% (OR = 5.29; 95% CI: 2.09, 13.39) and 273% (OR = 3.73; 95% CI: 1.57, 8.86) for the Q4 group of monoethyl phthalate and monoisobutyl phthalate, respectively.

Conclusion: The detection rate of PAEs metabolites is common, and the exposure level of PAEs metabolites was associated with the risk of abdominal obesity in Chinese students aged 7–10 years.

What is Known:

• The prevalence of childhood abdominal obesity had increased sharply from 4.9% in 1993 to 17.5% in 2014 in China. More than 80% of the Chinese children and adolescents have measurable level of several PAEs metabolites in the urine. Previous studies with limited sample had explored the association between DEHP metabolites exposure and childhood abdominal obesity risk, however, the association were inconsistent.

What is New:

• The detection rate of PAEs metabolites is common among Chinese children aged 7-10 years. Boys had higher concentrations of PAEs metabolites than girls (P < 0.05), except for monoethyl phthalate. Compared with the Q1 group of PAEs metabolites, the risk of childhood abdominal obesity increased to 429% and 273% for the Q4 group of monoethyl phthalate and monoisobutyl phthalate, respectively.

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Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

PAEs:

Phthalates

CBPEF:

Childhood Blood Pressure and Environmental Factors

MMP:

Monomethyl phthalate

MEP:

Monoethyl phthalate

MBP:

Mono-n-butyl phthalate

MiBP:

Monoisobutyl phthalate

MEHP:

Mono(2-ethylhexyl) phthalate

MEOHP:

Mono(2-ethyl-5-oxyethyl) phthalate

MEHHP:

Mono(2-ethyl-phthalate) 5-hydroxyethyl) ester

IPAQ-SF:

International Physical Activity Questionnaire short form

LBW:

Low birth weight

NBW:

Normal birth weight

HBW:

High birth weight

BMI:

Body mass index

SD:

Standard deviation

LOD:

Limit of detection

WC:

Waist circumference

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Acknowledgements

The authors greatly appreciate the Educational Administration Leaderships and primary and middle school health nurses in Xiamen City. The authors would additionally acknowledge all participants and investigators for their cooperation and efforts.

Funding

The project was supported by the Guangdong Medical Research Fund (A2022501), the Science and Technology Program of Guangzhou (No.202201011070), and the National Science Foundation of China (NSFC 81,773,454).

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Authors

Contributions

ZZ and ZW were co-investigators and designed the study, ZW and DG carried out the initial analysis, and ZZ and ZW supervised data analysis. All authors were involved in writing the paper and had final approval of the submitted and published versions. ZZ take full responsibility for the whole work.

Corresponding authors

Correspondence to Zheng-he Wang or Zhi-yong Zou.

Ethics declarations

Ethics approval and consent to participate

The study was approved by the Medical Ethical Committee of Peking University Health Science Center (IRB00001052-17026). Written informed consent was obtained from all participants and their parents or guardians.

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Not applicable.

Competing interests

The authors declare no competing interests.

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Communicated by Peter de Winter

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Wang, Zh., Gao, D. & Zou, Zy. The association of phthalate metabolites with childhood waist circumference and abdominal obesity. Eur J Pediatr 182, 803–812 (2023). https://doi.org/10.1007/s00431-022-04751-x

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