Role of race in the seasonality of deliveries with preeclampsia

Bullock, Nicole; McCoy, Sarah J. Breese; Payton, Mark E.

doi:10.1016/j.mehy.2011.07.013

“…Although the stages of pregnancy in the included studies were different, we combined them by gestation period. For example, in the studies on delivery and conception months, women who conceived in hot months generally delivered in cold months in the following year (11,18,22,27,32). Women who conceived in June and delivered in March had the highest risk of preeclampsia (22).…”

Section: Main Ndingsmentioning

confidence: 99%

“…Fourteen articles assessed the relationship between delivery season and HDP(6,7,11,(18)(19)(20)(21)(26)(27)(28)(29)(30)(31)(32), and eleven articles with su cient data were included in the meta-analysis (6, 7, 18-21, 27-31). Because the heterogeneity between studies was high (p < 0.1, I 2 > 25%), we used a random effects model to pool the ORs and 95% CIs.…”

mentioning

confidence: 99%

The Association Between Season and Hypertensive Disorders in Pregnancy: a Systematic Review and Meta-analysis

Liao

¹

,

Wei

²

,

Liu

³

et al. 2022

Reprod. Sci.

2

0

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Background: There is increasing and inconsistent evidence of a relationship between hypertensive disorders of pregnancy (HDP) and season of delivery or conception.Methods: Four databases, the Cochrane Library, PubMed, EMBASE and Web of Science, were searched until September 29th, 2021. Two authors extracted data independently. A random effects model and the Mantel-Haenszel method were used to calculate pooled ORs and 95% CIs.Results: Twenty articles were included in the systematic review, and 11 articles were included in the meta-analysis. The quantitative analysis of the association between delivery season and HDP showed that the odds of HDP was higher in women who deliver in winter than in those who delivered in summer (OR=1.18, 95% CI 1.02-1.38, p < 0.001) and all other seasons (OR = 1.17, 95% CI 1.03-1.34, p <0.001). In the qualitative analysis of the association between conception season and HDP, 4 of 7 studies suggested that women who conceived in summer had a higher risk of HDP than those who conceived in other seasons.Conclusions: Based on the evidence to date, we found weakly positive relationships between HDP and summer conception and winter delivery. BackgroundHypertensive disorders of pregnancy (HDP) is a common obstetric disease, occurring in 5%-10% of all pregnancies and accounting for 10%-16% of total pregnancy-related deaths; it is the leading cause of maternal death (1, 2). HDP not only has short-term impacts during pregnancy but also longterm impacts on the health of mothers and their offspring, potentially causing maternal coronary heart disease, stroke and hypertension in offspring (3-5). At present, the precise etiology of HDP is unclear and is considered to be the result of the interaction between genes and the environment.However, a number of risk factors have been demonstrated, such as older age, low maternal educational status and multiple pregnancies (6, 7).Seasonal changes affect the occurrence and development of many diseases, such as cardiovascular diseases and autoimmune diseases (8, 9).Similarly, seasonal changes also increased the risk of maternal and neonatal mortality and the incidence of delivery complications (10). HDP deserves our attention because some studies have reported that HDP is associated with season, but the ndings have been inconsistent. Some researchers reported that the prevalence rates of gestational hypertension and preeclampsia were higher in women who delivered in winter and conceived in summer (7,11). However, some studies found no association with season (6) or found an opposite result (12).It is important to synthesize such ndings to determine which season or month of delivery or conception is related to HDP to facilitate HDP management and interventions targeting high-risk groups. MethodsThe Meta-Analysis of Observational Studies in Epidemiology (MOOSE) (13) and Preferred Reporting Items for Systematic review and Meta-Analyses (PRISMA) (14) guidelines were followed for this systematic review and meta-analysis. This study did not require ethical approval or...

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Current World Literature

2012

Current Opinion in Obstetrics &Amp; Gynecology

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The Association between Season and Hypertensive Disorders of Pregnancy: A Systematic Review and Meta-Analysis

Liao

¹

,

Wei

²

,

Liu

³

et al. 2021

Preprint

0

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Background: There is increasing and inconsistent evidence of a relationship between hypertensive disorders of pregnancy (HDP) and season of delivery or conception.Methods: Four databases, the Cochrane Library, PubMed, EMBASE and Web of Science, were searched until September 29th, 2021. Two authors extracted data independently. A random effects model and the Mantel-Haenszel method were used to calculate pooled ORs and 95% CIs.Results: Twenty articles were included in the systematic review, and 11 articles were included in the meta-analysis. The quantitative analysis of the association between delivery season and HDP showed that the odds of HDP was higher in women who deliver in winter than in those who delivered in summer (OR=1.18, 95% CI 1.02-1.38, p < 0.001) and all other seasons (OR = 1.17, 95% CI 1.03-1.34, p <0.001). In the qualitative analysis of the association between conception season and HDP, 4 of 7 studies suggested that women who conceived in summer had a higher risk of HDP than those who conceived in other seasons.Conclusions: Based on the evidence to date, we found weakly positive relationships between HDP and summer conception and winter delivery.

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Role of race in the seasonality of deliveries with preeclampsia

Cited by 4 publications

References 13 publications

The Association Between Season and Hypertensive Disorders in Pregnancy: a Systematic Review and Meta-analysis

The Association Between Season and Hypertensive Disorders in Pregnancy: a Systematic Review and Meta-analysis

Current World Literature

The Association between Season and Hypertensive Disorders of Pregnancy: A Systematic Review and Meta-Analysis

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