The Impact of Physical Demands and Work Hours on the Risk of Preterm Birth Among Black Women.

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Journal of occupational and environmental medicine Pub Date : 2026-09-01 Epub Date: 2026-03-17 DOI:10.1097/JOM.0000000000003711

Florence N Kizza, Danielle R Gartner, Xiaoyu Liang, Laurel Harduar Morano, Candice Y Johnson, Dawn P Misra

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Abstract

Objective: We investigated the impact of work hours and occupational physical demands on preterm birth (PTB) and explored potential effect modifiers of these associations.

Methods: Four hundred twenty-nine Black women employed during pregnancy self-reported hours worked per week. The Karasek Job Content Questionnaire assessed prenatal occupational physical demands. Log binomial regression models were used to estimate associations, adjust for potential confounders, and investigate effect measure modification by psychosocial factors and racism.

Results: Prolonged work hours (>40 h/wk) (adjusted prevalence ratio = 1.83; 95% confidence interval: 0.85-3.94) and heavy lifting (adjusted prevalence ratio = 1.33; 95% confidence interval: 0.88-2.00) were associated with increased PTB prevalence, but awkward body positions were inversely associated with PTB. Social support modified the physical demands and PTB association.

Conclusions: Both occupational exposures and nonoccupational factors, such as social support, may be important in the etiology of PTB.

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体力需求和工作时间对黑人妇女早产风险的影响。

目的：研究工作时间和职业体力需求对早产（PTB）的影响，并探讨这些关联的潜在影响因素。方法：429名怀孕期间受雇的黑人妇女自我报告每周工作时间。Karasek工作内容问卷评估产前职业身体需求。对数二项回归模型用于估计关联，调整潜在的混杂因素，并调查社会心理因素和种族主义对效果测量的修改。结果：长时间工作（40小时/周）（aPR = 1.83; 95% CI: 0.85, 3.94）和举重（aPR = 1.33; 95% CI: 0.88, 2.00）与PTB患病率增加相关，但尴尬的体位与PTB患病率呈负相关。社会支持改变了生理需求与PTB的关系。结论：职业暴露和非职业因素（如社会支持）在肺结核发病中都可能起重要作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of occupational and environmental medicine

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