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Retrospective study reveals that overweight and obesity increase preterm birth risk in Chinese women, suggesting BMI management is vital.
In Chinese population, pre-pregnancy underweight and severity of underweight were not significantly associated with the risk of PTB; while overweight and obesity increased the risk of PTB. The nadir of PTB risk corresponded to a PPBMI of approximately 18.5-21.5 kg/m², with a potential risk threshold around 24.5 kg/m².
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Li et al. (2026) studied this question.
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