Maternal and dietary behavior-related factors associated with preterm birth in Southeastern Terai, Nepal: A cross sectional study

Acharya, Dilaram; Gautam, Santosh; Poder, Thomas G.; Lewin, Antoine; Gaussen, Amaury; Lee, Kwan; Singh, Jitendra Kumar

doi:10.3389/fpubh.2022.946657

Cited by 2 publications

(3 citation statements)

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“…Disrupted sleep and increased maternal discomfort during hot nights could contribute to adverse pregnancy outcomes . Sleep disturbances increase PTB risk, and nighttime temperature extremes can disrupt sleep patterns, potential leading to physiological consequences.…”

Section: Discussionmentioning

confidence: 99%

“…Emerging evidence suggests that nighttime temperature, particularly extreme nighttime heat, significantly impacts health, including sleep and rest . Sleep quality and duration affect various aspects of health, and disturbances in these factors may have consequences for pregnancy outcomes . High nighttime temperatures can disrupt circadian rhythms and entrainment, potentially affecting blood pressure, especially in vulnerable people like pregnant individuals .…”

Section: Introductionmentioning

confidence: 99%

“…8 Sleep quality and duration affect various aspects of health, and disturbances in these factors may have consequences for pregnancy outcomes. [9][10][11] High nighttime temperatures can disrupt circadian rhythms and entrainment, potentially affecting blood pressure, especially in vulnerable people like pregnant individuals. 12 Blood pressure follows diurnal patterns, including sleep-related elevations, and high maternal blood pressure is linked to increased adverse birth outcomes.…”

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confidence: 99%

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Heat Exposure, Preterm Birth, and the Role of Greenness in Australia

Ye,

Guo,

Huang

et al. 2024

JAMA Pediatr

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ImportancePreterm birth (PTB) is associated with adverse health outcomes. The outcomes of heat exposure during pregnancy and the moderating association of greenness with PTB remain understudied.ObjectiveTo investigate associations between heat exposure, greenness, and PTB, as well as interactions between these factors.Design, Setting, and ParticipantsIncluded in this cohort study were births occurring in Sydney, New South Wales, Australia, between 2000 and 2020, retrieved from New South Wales Midwives Data Collection. Participants with incomplete or missing data on their residential address or those who resided outside of New South Wales during their pregnancy were excluded. Data were analyzed from March to October 2023.ExposuresGreenness measured using normalized difference vegetation index (NDVI) and tree cover derived from satellite images. Daily extreme heat and nighttime extreme heat were defined as above the 95th percentile of community- and trimester-specific daily mean temperatures and nighttime temperatures.Main Outcomes and MeasuresLogistic regression models estimated the independent association of extreme heat with PTB, adjusting for individual- and area-level covariates, season of conception, and long-term trend. An interaction term between extreme heat exposure and greenness was included to explore potential modification. With a significant interaction observed, the number of preventable heat-associated PTBs that were associated with greenness was estimated.ResultsA total of 1 225 722 births (median [IQR] age, 39 [38-40] weeks; 631 005 male [51.5%]) were included in the analysis, including 63 144 PTBs (median [IQR] age, 35 [34-36] weeks; 34 822 male [55.1%]). Compared with those without heat exposure, exposure to daily extreme heat and nighttime extreme heat in the third trimester was associated with increased risks of PTB, with an adjusted odds ratio (OR) of 1.61 (95% CI, 1.55-1.67) and 1.51 (95% CI, 1.46-1.56]), respectively (PTB rates: exposed, 4615 of 61 338 [7.5%] vs unexposed, 56 440 of 1 162 295 [4.9%] for daily extreme heat and 4332 of 61 337 [7.1%] vs 56 723 of 1 162 296 [4.9%] for nighttime extreme heat). Disparities in associations between extreme heat exposure and PTB were observed, with lower odds of PTB among pregnant individuals residing in greener areas. The associations between extreme heat exposure and PTB could be mitigated significantly by higher greenness. Improving NDVI and tree cover could reduce daily extreme heat-associated PTB by 13.7% (95% CI, 2.3%-15.1%) and 20.9% (95% CI, 5.8%-31.5%), respectively. For nighttime extreme heat-associated PTB, reductions were 13.0% (0.2%-15.4%) and 17.2% (4.1%-27.0%), respectively.Conclusions and RelevanceResults of this large birth cohort study suggest that extreme heat exposure was adversely associated with PTB, with greenness playing a moderating role. Increasing greenness levels in residential communities could prevent heat-associated PTBs. These findings emphasize the importance of integrating heat mitigation strategies and improving green space in urban planning and public health interventions.

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Section: Discussionmentioning

confidence: 99%