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Are Meteorological Conditions within the First Trimester of Pregnancy Associated with the Risk of Severe Pre‐Eclampsia?
Author(s) -
Tran ThiChien,
Boumendil Ariane,
Bussieres Laurence,
Lebreton Elodie,
Ropers Jacques,
Rozenberg Patrick,
Aegerter Philippe
Publication year - 2015
Publication title -
paediatric and perinatal epidemiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.667
H-Index - 88
eISSN - 1365-3016
pISSN - 0269-5022
DOI - 10.1111/ppe.12196
Subject(s) - medicine , confidence interval , pregnancy , eclampsia , odds ratio , first trimester , obstetrics , demography , singleton , early pregnancy factor , gestation , genetics , sociology , biology
Background Severe pre‐eclampsia ( SPE ) is the second cause of maternal death in developed countries. The literature suggests different risk factors for early‐ and late‐onset pre‐eclampsia. SPE is usually related to the early‐onset type. Pre‐eclampsia rate exhibits seasonal variation. However, the weather– SPE association is still unknown. We examined the associations between maternal exposure to meteorological parameters after conception and SPE . Methods From 2008 to 2011, all deliveries of women living in the Y velines area, F rance, have been prospectively registered. Meteorological measurements from weather stations scattered inside Y velines were averaged on two exposure windows: early‐pregnancy (30 days after conception) and first‐trimester (90 days after conception). The relationship between SPE and season of conception was also examined. Hierarchical complementary log–log regression models were used to estimate the weather– SPE association. Results SPE was diagnosed in 526 (0.8%) out of 63 633 singleton pregnancies. Increasing temperature or sunshine across both windows was associated with increased SPE risk. Early‐pregnancy minimum temperature showed the strongest effect with adjusted odds ratio ( OR ) per 1 degree Celsius: 1.03 [95% confidence interval ( CI ) 1.01, 1.04]. The risk of SPE was higher when conception was in summer as compared to winter ( OR 1.53, 95% CI 1.27, 1.85). Effect estimates showed only small variations in sensitivity analyses. Conclusions Our findings of a weather impact during early pregnancy on SPE may provide a new clue for understanding the causes of pre‐eclampsia. Further investigation into the biologic mechanisms for this finding is required.