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. 2023 Jan 23;9:e41442. doi: 10.2196/41442

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©Zhichao Yuan, Hai-Jun Wang, Qin Li, Tao Su, Jie Yang, Junjun Chen, Yuanzhou Peng, Shuang Zhou, Heling Bao, Shusheng Luo, Hui Wang, Jue Liu, Na Han, Yuming Guo, Yuelong Ji. Originally published in JMIR Public Health and Surveillance (https://publichealth.jmir.org), 23.01.2023.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Public Health and Surveillance, is properly cited. The complete bibliographic information, a link to the original publication on https://publichealth.jmir.org, as well as this copyright and license information must be included.

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The stratified associations between PM₁ exposure and de novo hypertensive disorders of pregnancy for different maternal characteristics. A and B show the association in unemployed and employed women, respectively. C and D show the association in multiparous and primiparous women, respectively. E and F show the association in women with higher and lower education status, respectively. HR: hazard ratio; PM: particulate matter.