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  • Systematic Review
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Gestational age and the risk of allergic diseases: a systematic review and meta-analysis

Abstract

Background

The perinatal period has been postulated to be a window of opportunities in preventing atopic disorders. Accumulating studies suggested that an association exists between gestational age (GA) and allergic diseases.

Methods

The meta-analysis of observational studies was conducted through a search of relevant literature until 31 December 2023 from PubMed, Embase, and Web of Science databases. Subgroup analyses and sensitivity analyses were performed to test the robustness and consistency of the observed associations.

Results

Thirty observational studies comprising 5,410,969 participants were included in the meta-analysis. The pooled estimates (odds ratio [OR]) of atopic dermatitis (AD) risk for early preterm, preterm and post-term birth were 0.75 (95% confidence interval [CI]: 0.68–0.82), 0.86 (95% CI: 0.81–0.93), 1.08 (95% CI: 1.03–1.14), respectively. Additionally, early preterm birth was suggestively associated with reduced risk of allergic rhinitis (AR) (OR: 0.84, 95% CI: 0.73–0.97).

Conclusion

Our study demonstrated that early preterm and preterm births were associated with a reduced risk of AD, while post-term birth was linked to an increased risk, with early preterm birth also suggestively associated with a reduced risk of AR.

Impact

  • This large-scale meta-analysis demonstrates that early preterm and preterm births are associated with a significantly reduced risk of atopic dermatitis (AD), while post-term birth is linked to an increased risk.

  • Early preterm birth is also suggestively associated with a lower risk of allergic rhinitis (AR), highlighting the nuanced role of gestational age in the development of allergic diseases.

  • These findings underscore the importance of the perinatal period as a critical window for allergy risk stratification and early prevention strategies in pediatric populations.

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Fig. 1: Flowchart of study inclusion and exclusion.
Fig. 2: Forest plots of gestational age and allergic diseases.

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Data availability

The datasets used and/or analyzed during the current study are publicly available and accessible.

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Acknowledgements

The authors sincerely thank the researchers and participants of the original articles for their collection and management of data resources.

Funding

This work was supported by grants from the National Natural Science Foundation of China (82204843), the Medical and Health Science and Technology Program of Zhejiang Province (2023KY845), the Traditional Chinese Medicine Science and Technology Program of Zhejiang Province (2023ZR084), Youth Talent Support Program of Zhejiang Provincial Science and Technology Association (2024-HT-334), and Natural Science Youth Exploration Program of Zhejiang Chinese Medicine University (2023JKZKTS12).

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Contributions

XZ, KL, DY, JC, and XJ were responsible for the statistical analysis. YM, JL, and XS contributed to the conceptualization and methodology. XZ, KL, DY, and YM were responsible for writing, reviewing, and editing the subsequent and final drafts of the manuscript. All authors had full access to the study data and held final responsibility for the decision to submit the manuscript for publication.

Corresponding authors

Correspondence to Yingying Mao or Ding Ye.

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The authors declare no competing interests.

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This study is based on secondary analyses of previously published individual participant data (IPD). All original studies included had been independently registered and received ethics approval in accordance with the regulations of their respective countries and institutions.

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Zhao, X., Liu, K., Chen, J. et al. Gestational age and the risk of allergic diseases: a systematic review and meta-analysis. Pediatr Res (2025). https://doi.org/10.1038/s41390-025-04439-6

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