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Effect of season of birth on cord blood IgE and IgE at birth: a systematic review and meta-analysis
Susanto, Nugrobo Harry Vicendese, Don Salim, Agus Lowe, Adrian J. Dharmage, S. C. Tham, Rachel Lodge, Caroline Garden, Frances L. Allen, Katie Svanes, Cecilie
Susanto, Nugrobo Harry
Vicendese, Don
Salim, Agus
Lowe, Adrian J.
Dharmage, S. C.
Tham, Rachel
Lodge, Caroline
Garden, Frances L.
Allen, Katie
Svanes, Cecilie
Abstract
Background
Elevated cord blood IgE is important on the pathway to allergic disease. The association between season of birth and infant cord blood IgE is not well-established. Study findings differ on which birth season is associated with higher cord blood IgE risk and its magnitude. We conducted a systematic review and meta-analysis of studies on season of birth and cord blood IgE.
Methods
We searched Medline, Web of Science, Scopus and ProQuest Health databases, and reviewed reference lists of articles that met the inclusion criteria. All included studies measured IgE as a binary variable using various cut-off values. We performed multivariate-random-effects meta-analysis to handle an exposure with multiple categories of Season of Birth.
Results
Our search identified 275 records and 10 had sufficient data to be included in a meta-analysis. Relative to summer, winter birth had the greatest odds of high IgE (≥ 0.1 IU/ml), meta-analysis OR = 1.24 (95%CI: 1.01–1.52). A similar OR, was found for IgE ≥ 0.5 IU/ml, OR = 1.30 (95%CI: 0.99–1.71).
Conclusions
A winter season of birth was associated with statistically significant higher odds of elevated cord blood IgE at cut-off ≥ 0.1 IU/ml but borderline at cut-off ≥ 0.5 IU/ml. This winter effect is likely to be a marker for a range of other environmental exposures during specific stages of pregnancy, such as aeroallergen exposures, maternal infections and vitamin D levels. Further research is required to support our finding and to identify the exact mechanisms that lead to the winter season of birth effect on circulating IgE levels, as this may have implications for allergic disease prevention.
Keywords
Cord blood, IgE, Meta-analysis, Pollen, Season of birth
Date
2017
Type
Journal article
Journal
Environmental Research
Book
Volume
157
Issue
Page Range
198-205
Article Number
ACU Department
Mary MacKillop Institute for Health Research
Faculty of Health Sciences
Faculty of Health Sciences
Collections
Relation URI
Source URL
Event URL
Open Access Status
License
File Access
Controlled