Extreme temperature exposure increases the risk of preterm birth in women with abnormal pre-pregnancy body mass index: a cohort study in a southern province of China.

For all the BMI-related subgroups, corresponding with the results of our figures, the positive association between high-temperature exposure and the risk of PTB remained robust during all three trimesters, except that this effect failed to reach statistical significance for overweight or obese women in the first trimester.

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