The effect and its critical window for ambient temperature and humidity in pregnancy on term low birth weight

Du, Shuang; Bai, Shuoxin; Zhao, Xiaodong; Lin, Shaoqian; Zhai, Yifan; Wang, Zhaojun; Wang, Zhiping

doi:10.1007/s11356-022-19512-4

Cited by 12 publications

(4 citation statements)

References 37 publications

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“…We adopted Pearson correlation coe cient to conduct the correlation analysis of continuous variables. The mediating effect of environmental factors on the association between season and preterm birth was analyzed by sequential test [22,23].…”

Section: Discussionmentioning

confidence: 99%

“…From January 2018 to December 2019, when infants younger than one month visited outpatient clinics for vaccinations, infants and their mothers were recruited as study subjects for the birth cohort. The inclusion criteria (23,24) were: i) the infants had no congenital disease; ii) the mothers had been living in Jinan City during pregnancy; iii) the mothers did not have serious mental illness or language communication di culties; iiii) the mothers giving birth to a single child; iiiii) the mothers who gave birth between November 1, 2018 and October 31, 2019. Each mother was given a face-to-face questionnaire to obtain the relevant variables for the study.…”

Section: Study Populationmentioning

confidence: 99%

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Role for Environmental Factors on the Relationship Between Seasons of Conception and Preterm Birth: An Observational Study in China

2024

Int Internal Med J

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Background: The relationship between season and the risk of preterm birth is not consistent. Importantly, the role of environmental factors in it is not clear. Methods: Based on the baseline of the Jinan birth cohort, the mothers from the birth cohort were the subjects, and they were interviewed face-to-face by the questionnaire. The individual exposure levels of temperature and humidity during the first 30 days of pregnancy were calculated by an inverse distance weighting method. The effect of season on the risk of preterm birth was obtained by logistic regression model, and the mediating effect of environmental factors in the association between season and preterm birth was obtained by sequential test. Results: A total of 4.4 % (263/5984) of mothers had premature children. The rates of preterm birth were higher in winter (6.0 %) and summer (4.5 %) than that in spring (3.1 %). In the multivariable logistic regression model, the adjusted odds ratio and 95 % confidence interval for the risk of preterm birth at conception in winter and summer were 2.228 (1.512-3.316) and1.541 (1.055-2.277). However, after further adjustment for humidity, only the association between winter conception and preterm birth remained statistically significant (OR: 2.353, 95% CI: 1.594-3.511). Moreover, the humidity partially mediated the relationship (41.2 %) between conception in winter and preterm birth, and humidity in winter was negatively associated with the risk of preterm birth (indirect effect = -0.007, P < 0.001). Conclusions: For women living in the temperate regions, conception in summer and winter may increase the risk of preterm birth, and this association persisted in winter after adjusting for environmental factors. During the first 30 days of pregnancy, lower levels of humidity exposure in winter contributed to and mediated the relationship. The results may provide epidemiological evidence for pregnancy planning and care of women from the perspective of environmental factors.

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Section: Discussionmentioning

confidence: 99%

Section: Study Populationmentioning

confidence: 99%

Role for Environmental Factors on the Relationship Between Seasons of Conception and Preterm Birth: An Observational Study in China

2024

Int Internal Med J

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“…The details of the Jinan birth cohort have been described in the previous literature. 16,17 The study was approved by the Ethics Committee of Preventive Medicine of Shandong University (Approved number: 20170315) with the informed consent of all participants.…”

Section: Source Of Populationmentioning

confidence: 99%

The Association Between Exercise During Pregnancy and the Risk of Preterm Birth

Zhang,

Xiao,

Bai

et al. 2024

IJWH

Self Cite

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We aimed to examine the association between exercise during pregnancy and preterm birth (PTB). Methods: This study was a baseline survey of the Jinan birth cohort. The study subjects were the mothers one month after giving birth, which were investigated by questionnaires retrospectively containing physical exercise (frequency, time, and primary exercise patterns) during pregnancy and each trimester. Individual time spent on exercise and energy expenditure were assessed based on the questionnaires. PTB was clinically defined as a newborn born on or before the last day of the 37th week. Adjusted odds ratios (OR) were estimated using logistic regression to assess the relationship between exercise during pregnancy and the risk of PTB. Variable selection for the multivariate models was guided by the directed acyclic graph. The median effect was analyzed by the sequential test. Results:The prevalence of PTB in this study was 4.38% (285/6501). The adjusted OR (95% CI) for the risk of PTB related to exercise during pregnancy was 0.74 (0.58-0.95). During the 1st and 2nd trimesters, the ORs (95% CI) for 2.5 to 7 hours of exercise per week were 0.77 (0.59-0.99) and 0.74 (0.57-0.96). During the 3rd trimester, the ORs (95% CI) for 2.5 to 7 hours and more than 7 hours of exercise per week were 0.74 (0.56-0.96) and 0.65 (0.44-0.94). After stratifying the subjects, the association was only found among subjects without pregnancy complications. Pregnancy complications partially mediated (52.40%) the relationship between exercise during pregnancy and PTB. Conclusion: Exercise during pregnancy can reduce the risk of PTB for women without pregnancy complications. 2.5 to 7 hours of exercise (like walking) per week may be appropriate in three trimesters of pregnancy, and the time could be extended in the 3rd trimester.

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“…The study population was subjects who completed 2-year follow-up in the Jinan Birth Cohort, a baseline population recruited from January 2018 to December 2019 from 15 vaccination clinics selected in urban areas of Jinan, Shandong Province, and surveyed at the second vaccination of infants at 1 month of age for hepatitis B vaccine according to the national immunization plan. The details of the cohort were described in the previously published article (Bai et al, 2023;Du et al, 2022).…”

Section: Study Populationmentioning

confidence: 99%

Effect of early life exposure to air pollutants on the incidence of eczema in children under 2 years

Wang

Liang

Lin

et al. 2023

Preprint

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Background: The incidence of eczema is higher in children aged 0-2 years, but the long-term effect of air pollutants exposure in early life on the risk of eczema development is unclear. Methods: We conducted a birth cohort study in Jinan, China, to explore the effect of early life air pollutant exposure on the risk of eczema in younger children. An inverse distance weighting method was used for individual exposure assessment. Binary and multivariate logistic models were used to investigate the effects of air pollutants on eczema, the distributed lag model to find sensitive windows of exposure, weighted quantile sum model and principal component analysis to explore the combined effects of multiple pollutants. Results: The cumulative incidence rate for eczema among 5819 children aged 2 was 19.8%. Exposure to high levels of O during pregnancy ( OR 1.12, 95% CI 1.06-1.19) and during the first year after birth ( OR 1.24, 95% CI 1.03-1.50) increased the risk of eczema. PM during pregnancy ( OR 1.31, 95% CI 1.20-1.43), PM ( OR 1.08, 95% CI 1.01-1.15) and PM ( OR 1.07, 95% CI 1.00-1.14) during the first year after birth also increased the risk of eczema. The critical window for O and PM exposure was the third trimester and early postnatal period. Moreover, in the combined effect of multiple pollutants, O played a dominant role during pregnancy (weighting > 0.3), with a predominantly O principal component associated with eczema risk (adjusted OR 1.011, 95% CI 1.007-1.015). Conclusions: Exposure to air pollutants O and PM in early life increased the risk of eczema at 0-2 years of age, and the sensitivity window appeared earlier. O exposure during pregnancy played a key role in the combined effect of pollutants on eczema risk.

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The effect and its critical window for ambient temperature and humidity in pregnancy on term low birth weight

Cited by 12 publications

References 37 publications

Role for Environmental Factors on the Relationship Between Seasons of Conception and Preterm Birth: An Observational Study in China

Role for Environmental Factors on the Relationship Between Seasons of Conception and Preterm Birth: An Observational Study in China

The Association Between Exercise During Pregnancy and the Risk of Preterm Birth

Effect of early life exposure to air pollutants on the incidence of eczema in children under 2 years

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